Visual jank when editing answers in experimental plan mode #8878

Description

Using OPENCODE_EXPERIMENTAL_PLAN_MODE=1, when going back to edit one of the custom answers (that are longer than a few characters, presumably), I get flickering text that seems to cycle through the lines in quick succession.

Plugins

none

OpenCode version

1.1.23

Steps to reproduce

1. OPENCODE_EXPERIMENTAL_PLAN_MODE=1 opencode
2. Get the agent to ask 2 (or more) questions at once
3. Pick "type your own answer" and fill out some text (presumably more than a single line)
4. On the "confirm" tab use the arrows to go back through the previous tabs.
5. Select the "type your own answer" option again to edit / expand the text you typed.
6. See janky cycling text
7. Type any character -> the jank stops and you're able to edit

Screenshot and/or share link

Operating System

macOS 26.1

Terminal

Ghostty 1.2.3