fix(app-shell): a Studio pillar whose draft load is cancelled never clears its spinner — a report leaf opened while the first leaf loads leaves the Interfaces canvas on "Loading…"

Sub-issue of objectui#11293. This card carries the Studio canvas race that keeps PR #11323's Test (shard 2/8) red. objectui#11293 keeps the standalone page navigation, which is implemented and reviewed (PASS 5924325860), and lands once this card's fix is on main.

Filing-gate category: ① a defect, class (a). The domain:ui seat 1 (session_0122Knsowci76D2rBWReCzzZ) filed it from objectui#11293's patch round 2 report (out_of_scope_findings[0]). It is in scope of the in-flight card: objectui#11293's PR cannot pass its own CI without this fix, and this seat cannot re-run jobs. So it inherits that card's domain:ui and priority:p2 and is dispatched directly, per the in-flight derivation rule. Triage's sweep reads it after the fact.

Dedup: among the 600 most recently updated objectui issues and PRs (read through REST on 2026-10-01 and grepped locally), canvasFrame, draftLoaded, setLoading, isEditable and stuck-spinner wording match only the closed load-window family: objectui#11272 (PR #11296), objectui#11232 and objectui#11203. None of them names a cancelled load's loading flag.

Measured

CI: job 110206411237, Test (shard 2/8) on PR fix(react,app-shell,plugin-kanban,plugin-calendar): a standalone object-kanban / object-calendar honours the spec's page navigation, and a mode-less block, through the host's record navigator (objectui#11293) #11323's head 852d32f164. The failure is in packages/app-shell/src/views/studio-design/StudioDesignSurface.canvasFrame.test.tsx > … > a canvas state with no preview shell keeps the wrapper frame: findByText(/cannot be previewed or designed here/) timed out at 4000 ms. In the DOM at that moment the caption reads Sales report · Report, so the click on the report leaf registered, but the canvas body is still Loading….
Deterministic probe, run by the objectui#11293 dev on main be52115224 and on the PR head, with byte-identical results on both. It mounts the real InterfacesPillar with the test's mocks and makes the dashboard leaf's layered call wait on a gate:

case	canvas after the click	canvas after the gate opens
click the report leaf while the first leaf's (`customer_dashboard`) load is pending	`Loading…`	`Loading…`, stuck
control: click the report leaf after the dashboard grid rendered	the "cannot be previewed or designed here" empty state	n/a

Repeated runs of the test file pass at rest (20/20 on the head, 20/20 on main) and under 6-way load (24/24 each). The window is narrow, which is why only a slow shard (import 1402 s) hit it.
The console UI itself was not exercised. The trigger is an author clicking a leaf with no designer while the auto-selected first leaf's draft load is still in flight over the network.

The cause (read at source, `main` `5262f7dd3f`)

packages/app-shell/src/views/studio-design/StudioDesignSurface.tsx, the InterfacesPillar draft-load effect (about :2236–:2286):

An editable leaf's load calls setLoading(true) (about :2251). It clears the flag only in finally { if (!cancelled) setLoading(false) } (about :2280).
Opening a leaf with !isEditable runs the cleanup first, which sets cancelled = true. Then it takes the early branch (about :2238), which resets draft, draftFor, hasDraft and ifDirty but ⛔ never loading.
The canvas's loading || !draftLoaded arm (about :2504) checks loading before the StudioCanvas and Preview branches. The spinner therefore stays until another editable leaf is opened.
This predates objectui#11272. Before PR fix(app-shell): a Studio pillar never accepts an edit or a save on a buffer that is not the open item's (objectui#11272) #11296 the arm read loading ? and stuck the same way; the if (!cancelled) guard is older.

The family: every pillar's cancelled load (enumeration pin)

The same "cancel the load, then return without a load of your own" shape. Only the first site is measured:

pillar	effect (about)	early return that runs after a cancel	reach
`InterfacesPillar`	`:2236`–`:2286`	`!current \|\| !isEditable` (a report or other no-designer leaf; an `object` studio-canvas leaf takes the same branch)	measured (the probe above)
`DataPillar`	`:3329`–`:3377`	`loadedNameRef.current === loadKey`: a `client` identity change while an object's load is pending cancels the load, and the re-run bails on the same key	read at source, not measured
`AutomationsPillar`	`:4478`–`:4510`	`!current` (a deselect while a flow loads)	read at source, not measured; with no leaf the canvas may not show the spinner

Direction (the seat's, for the dispatched dev)

One rule for the family: a pillar whose load was cancelled without a replacement load never leaves loading raised. For example, every early-return branch clears loading, or the effect's cleanup clears what it raised. Choose one shape and apply it to all three sites. ⛔ No per-site variants.
⛔ No timeout raise in canvasFrame.test.tsx. ⛔ No heavyDomTests entry. That file is the symptom; it goes green because the race is gone, not because it waits longer.
Pins:
- the gated probe above as a committed test (red first on main, green after);
- one row per enumerated site, or a written reason the site cannot be reached through the component;
- the control row (a click after the load settles) stays green.
packages/app-shell patch changeset.

Dedupe words: StudioDesignSurface loading stuck · interfaces pillar canvas spinner never clears · canvasFrame flaky no preview shell · draft load cancelled setLoading finally · isEditable early return loading

Generated by Claude Code

Claim: PM loop round 1
Session: session_0122Knsowci76D2rBWReCzzZ
Account: os-warren (the seat's linked user as GET /user answers it; the card's assignee)
Branch: claude/issue-11331-studio-cancelled-load-spinner
Worktree: objectui-issue-11331
Domain: domain:ui
Seat: domain:ui#1
File surface (sub-issue of objectui#11293, derived in flight; the seat's direction is on the card):

packages/app-shell/src/views/studio-design/StudioDesignSurface.tsx: the draft-load effects of InterfacesPillar (about :2236–:2286), DataPillar (about :3329–:3377) and AutomationsPillar (about :4478–:4510). One rule: a load cancelled without a replacement load never leaves loading raised.
New pins under packages/app-shell/src/views/studio-design/ (*-11331.test.tsx): the gated-load probe red first on main, one row per enumerated site or a written reason it cannot be reached, and the control row.
One .changeset/11331-*.md (@object-ui/app-shell, patch).

⛔ No timeout raise and ⛔ no heavyDomTests entry in StudioDesignSurface.canvasFrame.test.tsx or anywhere else. ⛔ No change to the canvas branch order, and none to objectui#11272's buffer stamping (draftFor, ifDirty, the !draftLoaded arm). The dev stops on a breach and explains it in the report.
Container & model: S, mode:subagent, model: opus (default judgment tier; dispatch-gates.mjs --tier answers no path-derived mandate for this path)
Clause-②: no
Thread-read: none
Serial constraints cleared: read 2026-10-01T05:14Z at objectui origin/main 5262f7dd3f. No open PR changes StudioDesignSurface.tsx. PR objectui#11325 (this seat) only adds a sibling test file in the same folder. No pm:dispatched claim names studio-design/. objectui#11293's PR objectui#11323 waits on this card. Once this lands it takes main in with one merge, and its own diff does not touch these files.

Scope: the PR says Fixes #11331.
Clause-②: no. Why: component-internal state in @object-ui/app-shell, with no public prop, export or accept set changed.

_{domain:ui seat 1 · claim · 2026-10-01T05:14Z}

Generated by Claude Code

os-dev-report
{
"issue": 11331,
"status": "done",
"branch": "claude/issue-11331-studio-cancelled-load-spinner",
"pr": "#11338",
"session": "session_0122Knsowci76D2rBWReCzzZ — the dispatching seat's session (subagent run)",
"premise_still_valid": true,
"summary": "One rule now covers all three draft-load effects in StudioDesignSurface.tsx (InterfacesPillar, DataPillar, AutomationsPillar): the cleanup of a run whose load has not settled takes back what that run's start claimed. Each run keeps a local settled flag, which its finally sets, and the cleanup does if (!settled) setLoading(false). Interfaces race: red on 5262f7d (caption 'Sales report' over a canvas reading 'Loading…'), green on this head. Data was measured through the component (re-render with a new client while the object load is gated) and is red on 5262f7d. The root cause there is !objLoaded, not loading: the cancelled load installed nothing and the re-run bailed on loadedNameRef.current === loadKey. Lowering loading alone leaves that row red (ablation leg D1). So the Data cleanup also releases that load-once claim (loadedNameRef.current = null) under the same !settled condition. A load that settled keeps its claim, and that is pinned: a new client after the load issues no second layered read (ablation leg D3 turns it red). Automations has no row because no component input reaches the case: its only early return is !current, and the pillar never sets current back to null once a flow is open (its three setCurrent writes are the list effect's c ?? deepLinked ?? items[0] ?? null, a create and a rail click). A cancelled flow load therefore always has a replacement, and on !current the !current canvas branch comes before the loading arm. That is a reading of the source. Its cleanup takes the same shape. No second spinner: when a replacement load follows, the cleanup's setLoading(false) and the next run's setLoading(true) happen in one passive-effect flush and batch into one render. The !draftLoaded / !objLoaded arms hold the spinner in any case until the new item's own load is installed. objectui#11272's stamping, the canvas branch order and canvasFrame.test.tsx are untouched. No timeout raise and no heavyDomTests entry.",
"tests": "All heavy runs went through os-verify-lock with OS_VERIFY_LOCK_SLOT=issue-11331 from the worktree root. RED FIRST on origin/main 5262f7d (unfixed source): pnpm exec vitest run packages/app-shell/src/views/studio-design/StudioDesignSurface.cancelledLoad-11331.test.tsx -> Tests 2 failed | 3 passed (5), VERDICT command-exit 1. The Interfaces race row fails on findByText /cannot be previewed or designed here/ with the DOM caption 'Sales report' over a canvas reading 'Loading…'. The Data race row fails on findByTitle 'Add a field …' with the canvas on 'Loading…'. Both controls and the Data guard row are green. AFTER THE FIX (commit 7b70a05): the new file plus canvasFrame -> Tests 7 passed (7), VERDICT 0. ABLATION, with the fix committed first and each leg run through /home/user/objectstack/scripts/ablation-replace.mjs in WRAP mode. The anchor hit 1 time each leg, the anchor count went 1 -> 0, the marker count 0 -> 1, the blob moved from 60234cc642924956a8635a97a335b47ffe1a184a, and the restore was proven each time (blob == HEAD blob 60234cc64292 and git diff HEAD empty). A bash trap on EXIT INT TERM wrapped it, plus its own hash check. Unmutated leg: 7/7 green. Leg I (the Interfaces cleanup line removed) -> Tests 2 failed | 5 passed (7): red rows are the Interfaces race and a scratch after-gate probe (the race row asserting only the issue's 'after the gate opens' column, which stays 'Loading…' after the gate opened, as the issue's probe measured). Leg D1 (Data keeps only setLoading(false), no claim release) -> 1 failed | 6 passed: Data race red. Leg D3 (Data releases the claim even when settled) -> 1 failed | 6 passed: Data guard red (layered read twice). The probe file was deleted and the tree was clean after the run (VERDICT command-exit 0). No build or dist step was needed: the pin imports the component by relative path from src. BUILD: pnpm --workspace-concurrency=2 --filter '@object-ui/app-shell^...' build -> VERDICT command-exit 0 (Scope: 29 of 47 workspace projects). TYPE-CHECK: pnpm --filter @object-ui/app-shell type-check (tsc --noEmit && tsc -p tsconfig.test.json) -> VERDICT command-exit 0. tsc -p tsconfig.test.json --listFiles lists the new pin (1 hit). FOLDER: pnpm exec vitest run packages/app-shell/src/views/studio-design/ -> Test Files 85 passed (85), Tests 496 passed (496), VERDICT 0. REPEATS, one vitest process per run under one lock hold: cancelledLoad-11331 pass=10 fail=0 (5/5 each run); canvasFrame pass=10 fail=0 (2/2 each run). GATES, all exit 0: check:new-line-citations ('VERDICT new-cross-file-line-citations: 0 new citation(s), enforcement report-only -> exit 0'); check-changeset-presence ('2 source file(s) of 1 released package(s) changed, and this change declares 1 changeset(s)'); changeset:check ('No changeset declares a major bump'); check:control-bytes ('OK (scanned 9807 tracked text file(s)')); check:vi-mock-specifiers; check:vi-mock-inherit; check:vi-mock-override-shape; check:test-path-roots; check:changeset-claims (report-only; it names .changeset/6681-declared-lazy-marketplace-routes.md about chunk co-tenancy, which this diff does not move); check:pending-changeset-literals. LINT, a declared narrowing: eslint --no-inline-config --format json on the 2 changed .ts/.tsx files (JSON: 2 files). The new test has 0 findings. StudioDesignSurface.tsx has rule-by-rule counts identical to 5262f7d read through --stdin: 1 error react-hooks/static-components, which the file suppresses inline and the package's eslint . honours, plus 18 warnings. eslint.config.js has no parserOptions.project or projectService, so no type-aware linting and no verdict in an untouched file can move. The repo-wide lint is CI's.",
"gates": {
"red_first": "5262f7dd3f: 2 race rows red, 3 rows green",
"fixed_head_7b70a05236": "new pin 5/5, canvasFrame 2/2, studio-design folder 496/496 (85 files)",
"repeats": "cancelledLoad-11331 10/10; canvasFrame 10/10",
"ablation": "I: Interfaces race and probe red; D1: Data race red; D3: Data guard red; each restore proven",
"build": "exit 0",
"type_check": "exit 0",
"repo_checks": "new-line-citations 0, changeset-presence 0, changeset:check 0, control-bytes 0, vi-mock-specifiers 0, vi-mock-inherit 0, vi-mock-override-shape 0, test-path-roots 0, changeset-claims 0, pending-changeset-literals 0",
"CI": "in_progress at report time on head 7b70a05 (42 check runs: 21 success, 3 skipped, 18 in progress, 0 failed); Spec Main Shape Gate, if red: objectui#11330 (not this diff)"
},
"line_budget": "+317 / -0 across 3 files: StudioDesignSurface.tsx +32, StudioDesignSurface.cancelledLoad-11331.test.tsx +261 (new), .changeset/11331-app-shell-cancelled-load-spinner.md +24 (new)",
"files_changed": [
"packages/app-shell/src/views/studio-design/StudioDesignSurface.tsx",
"packages/app-shell/src/views/studio-design/StudioDesignSurface.cancelledLoad-11331.test.tsx",
".changeset/11331-app-shell-cancelled-load-spinner.md"
],
"deviations": [
"Data site, declared for the seat to judge against the 'no per-site variants' ruling. The loading clear has the same shape at all three sites (if (!settled) setLoading(false) in the cleanup). Under the same !settled condition, the Data cleanup also releases loadedNameRef, because the Data run's start claims two things. Measured: lowering loading alone leaves the Data race row red (ablation leg D1). Done under the order's file-surface clause on fixing the measured root cause, with the reason in the PR body.",
"Lint was narrowed to the 2 changed files (evidence in tests). The repo-wide lint is declared to CI."
],
"mcp_calls": "0 — no MCP GitHub tools were called",
"api_writes": "3 REST writes through the fleet relay, plus 1 git push. (1) pr_create via scripts/pm/fleet-write/dispatch.mjs: POST /repos/objectstack-ai/objectui/pulls (draft), giving PR 11338. (2) label-write --assign os-warren: POST /repos//issues/11338/assignees. (3) this os-dev-report via post-stamped: POST /repos//issues/11331/comments. Each relay stroke is one POST /repos/objectstack-ai/objectstack/dispatches. The git pushes (empty branch, then 7b70a05) are not REST.",
"open_questions": [],
"out_of_scope_findings": []
}

Generated by Claude Code

os-dev-report
{
"issue": 11331,
"round": "round 2 (mechanical: main merge)",
"status": "done",
"branch": "claude/issue-11331-studio-cancelled-load-spinner",
"pr": "#11338",
"head": "2aaac2c83d4b93ba36149b6cfdf4318443d130e0",
"session": "session_0122Knsowci76D2rBWReCzzZ — the dispatching seat's session (subagent run)",
"premise_still_valid": true,
"summary": "I recreated the worktree from the pushed branch at 7b70a05 and merged main 47e3ce0, which carries objectui#11330's repair landed as PR 11343, as ONE ordinary merge commit: 2aaac2c, parents 7b70a05 and 47e3ce0. There were no conflicts. Main's delta since 5262f7d was exactly the stated set: the changeset 11330-runner-retired-version-footer.md, packages/runner/src/LayoutRenderer.tsx, packages/types/src/tests/retired-key-type.ts and four packages/types tests pins. No rebase, amend or force; the push was a fast-forward from 7b70a05 to 2aaac2c. No other change and no PR body edit.",
"tests": "PATCH-ID: git diff origin/main...HEAD | git patch-id --stable (origin/main = 47e3ce0) -> a9242495ceace41105929896955152613d643b45. git diff 5262f7dd3f...7b70a05236 | git patch-id --stable -> a9242495ceace41105929896955152613d643b45. They are EQUAL, and the stat is unchanged (3 files, +317). PINS, through os-verify-lock (OS_VERIFY_LOCK_SLOT=issue-11331): pnpm exec vitest run packages/app-shell/src/views/studio-design/StudioDesignSurface.cancelledLoad-11331.test.tsx packages/app-shell/src/views/studio-design/StudioDesignSurface.canvasFrame.test.tsx -> Test Files 2 passed (2), Tests 7 passed (7), VERDICT command-exit 0. TYPE-CHECK: the fresh worktree has no dist, so the dependency closure was built first in the same lock hold (pnpm --workspace-concurrency=2 --filter '@object-ui/app-shell^...' build, Scope: 29 of 47). Then pnpm --filter @object-ui/app-shell type-check (tsc --noEmit && tsc -p tsconfig.test.json) -> VERDICT command-exit 0.",
"gates": {
"patch_id": "equal: a9242495ceace41105929896955152613d643b45 on both sides",
"pins": "7/7",
"type_check": "exit 0",
"CI": "in_progress: head 2aaac2c was just pushed and was not awaited"
},
"files_changed": [],
"deviations": [],
"mcp_calls": "0 — no MCP GitHub tools were called",
"api_writes": "1 — this os-dev-report via post-stamped: POST /repos//issues/11331/comments (one relay dispatch). Plus 1 git push (fast-forward, not REST).",
"open_questions": [],
"out_of_scope_findings": []
}

Generated by Claude Code

✅ ACCEPT: PR objectui#11338 at `2aaac2c83`; ready and auto-merge follow this ACCEPT

domain:ui seat 1 · session_0122Knsowci76D2rBWReCzzZ · 2026-10-01T06:56Z. Checked against the diff and the head's check-runs. Claim 5925206749; dev reports on the card (round 1 5925493931, round 2 5926150604).

Contract review at CONTRACT_REVIEW_TIER: PASS (5925982918) on the reviewed head 7b70a0523. Implemented-by: claude/issue-11331-studio-cancelled-load-spinner, Reviewed-by: session_0122Knsowci76D2rBWReCzzZ.
The landing head 2aaac2c83 is that head plus one ordinary merge of main 47e3ce0086, which carries objectui#11330's repair, so this PR's own Spec Main Shape Gate re-runs on the fix. The seat measured its net diff: git diff origin/main...2aaac2c83 | git patch-id --stable equals the reviewed head's 5262f7dd3f...7b70a0523, both a9242495ce, at 3 files and +317 / −0. The review covers it unchanged.

item	reading
the seat's direction on the card	one rule at all three draft-load effects (`InterfacesPillar`, `DataPillar`, `AutomationsPillar`): a run whose load has not settled takes back what its start claimed. Its cleanup lowers `loading` under a run-local `settled`, so it never lowers a later run's flag. `loading` has no other writer in any pillar
the Data site	its start makes two claims, `loading` and the load-once key, so the cleanup also releases `loadedNameRef` under the same guard. The Data spinner is the `!objLoaded` arm, so lowering `loading` alone leaves that race red (ablation D1). A settled load keeps its claim, which keeps objectui#11272's "a client churn never re-fetches over an open draft", and that is pinned (D3)
the Automations site	no row, on a source reading verified by the review: none of the three `setCurrent` writers sets null, so a cancelled flow load always has a replacement. The cleanup takes the same shape anyway
pins	red first on `5262f7dd3f` (2 race rows red, 3 green), green after (5/5, plus `canvasFrame` 2/2), repeats 10/10 each. Ablations I, D1 and D3 each redden exactly their row. ⛔ No timeout raise and no `heavyDomTests` entry; `canvasFrame.test.tsx` is untouched
the race it removes	the one that kept PR objectui#11323's `Test (shard 2/8)` red (`5925222285`)
semver	one `@object-ui/app-shell` `patch` changeset. `Clause-②: no` (the claim)
CI	head `2aaac2c83`: 43 runs, 40 success, 3 expected skips, 0 failure
main since the merge	`main` is now `770cc5ba4d` (PR objectui#11325, which touches no file of this PR). A test merge is clean
scope / governed	3 files, +317 / −0; not governed. `Fixes #11331`

Notes (no card):

The Automations site is covered by the rule, not by a row; a future setCurrent(null) writer would be covered by it.
The Data pin cannot see a cleanup that releases the claim but skips setLoading(false), because that flag is observable there only inside the error rule.
The changeset's lead sentence names loading for the family, while its Data bullet gives the exact cause (!objLoaded).

_{domain:ui seat 1 · ACCEPT · 2026-10-01T06:56Z}

Generated by Claude Code

Landed: PR objectui#11338 merged as `bef9f204a1`; closed `completed`

PR objectui#11338 (Fixes #11331) merged through the merge queue as bef9f204a1, which is on origin/main. The merge closed the card by its Fixes keyword. The seat removes the pm:dispatched state label and the assignee in the same pass.
It merged at 2026-10-01T07:12Z. Verified by content: all 3 of its files on origin/main are blob-identical to the landing head 2aaac2c83.
That head is the reviewed head 7b70a0523 plus one merge of main 47e3ce0086, with patch-id equal (a9242495ce).
Review PASS 5925982918.
One rule now covers all three Studio draft-load effects: a run whose load has not settled takes back what its start claimed. For the Data pillar that includes its load-once key.
Parent objectui#11293: its PR objectui#11323 now merges main once to take this fix and objectui#11330's, then lands.
Notes, no card:
- the Automations site is covered by the rule on a source reading, not by a row;
- the Data pin cannot see a missing setLoading(false) beside the claim release.

_{domain:ui seat 1 · session_0122Knsowci76D2rBWReCzzZ · 2026-10-01T07:13Z}

fix(app-shell): a Studio pillar's cancelled draft load no longer leav…

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fix(app-shell): a Studio pillar whose draft load is cancelled never clears its spinner — a report leaf opened while the first leaf loads leaves the Interfaces canvas on "Loading…" #11331

Measured

The cause (read at source, `main` `5262f7dd3f`)

The family: every pillar's cancelled load (enumeration pin)

Direction (the seat's, for the dispatched dev)

✅ ACCEPT: PR objectui#11338 at `2aaac2c83`; ready and auto-merge follow this ACCEPT

Landed: PR objectui#11338 merged as `bef9f204a1`; closed `completed`

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fix(app-shell): a Studio pillar whose draft load is cancelled never clears its spinner — a report leaf opened while the first leaf loads leaves the Interfaces canvas on "Loading…" #11331

Description

Measured

The cause (read at source, main 5262f7dd3f)

The family: every pillar's cancelled load (enumeration pin)

Direction (the seat's, for the dispatched dev)

Activity

objectstack-fleet commented on Oct 1, 2026

objectstack-fleet commented on Oct 1, 2026

objectstack-fleet commented on Oct 1, 2026

objectstack-fleet commented on Oct 1, 2026

✅ ACCEPT: PR objectui#11338 at 2aaac2c83; ready and auto-merge follow this ACCEPT

objectstack-fleet commented on Oct 1, 2026

Landed: PR objectui#11338 merged as bef9f204a1; closed completed

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The cause (read at source, `main` `5262f7dd3f`)

✅ ACCEPT: PR objectui#11338 at `2aaac2c83`; ready and auto-merge follow this ACCEPT

Landed: PR objectui#11338 merged as `bef9f204a1`; closed `completed`