Remove-PSReadLineKeyHandler fails for chord Ctrl+Alt+? (Windows)

[ahinterl]

Though the PowerShell (7.5.2) command Remove-PSReadLineKeyHandler -Chord Ctrl+Alt+? on Windows 11 doesn't return any error, it has no effect. Get-PSReadLineKeyHandler shows me that the key binding still exists.

[PhantomBugz (PhantomBugz)]

I can reproduce this on Windows with PowerShell 7.6.9 / PSReadLine 2.4.5. The literal Ctrl+Alt+? removal leaves the default ShowKeyBindings entry in place, but this explicit physical-key form removes it on my setup:

Remove-PSReadLineKeyHandler -Chord 'Ctrl+Alt+Shift+Oem2'

# Verify by enumerating the bound keys:
Get-PSReadLineKeyHandler -Bound |
    Where-Object Key -eq 'Ctrl+Alt+?'

The verification command produces no entry after the removal. I also checked that the other bound keys were unchanged.

One detail that can obscure the result: Get-PSReadLineKeyHandler -Chord 'Ctrl+Alt+?' returned nothing on my setup before removing the binding, even though enumerating -Bound showed it. Enumerating the bindings avoids relying on that same literal-chord lookup to verify the removal.

This appears related to the character/modifier normalization problem described in #3508. Oem2 with Shift is the slash/question-mark key on a US-style layout; this workaround is layout-specific. I haven't tested other keyboard layouts or your original PowerShell 7.5.2 environment.

AI-assisted reply; the failure, workaround, and remaining bindings were checked in an isolated local process.