[Bug]: AskUserQuestion multiSelect still commits on first click — #6027 closed with no fix, reproduces on 0.0.34

[Sumstead72]

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Re-filing rather than commenting because the prior report is closed and
unlikely to be seen. See "Relationship to #6027 and #2707" below.

Area

apps/web

Steps to reproduce

1. Have the Claude provider call AskUserQuestion with a question configured
   multiSelect: true and 3–4 options.
2. Observe the panel renders the subtitle "Select one or more options".
3. Click any option.

Expected behavior

Options toggle on and off, accumulating a set. A "Submit answers" action commits
all selected options together, and the model receives the full set.

Actual behavior

The first click immediately commits that single option and advances to the next
question. There is no chance to toggle a second option. Multi-select silently
degrades to single-select, and the model receives one answer where several were
intended — with nothing on either side indicating the loss.

Notably the subtitle is correct: the client does read multiSelect for the
"Select one or more options" copy, but the option click handler still commits and
advances as if the question were single-select. A "Submit answers" button is
present in the footer but the click handler fires before it can be used.

Impact

Major degradation or frequent failure. The wrong answer is silently substituted —
the agent proceeds on incomplete input, and neither the user nor the model can
detect that the other options were dropped.

Version or commit

0.0.34 nightly. The installed executable reports ProductVersion 0.0.34.0; the
full nightly build string is not exposed in the installed files.

Environment

T3 Code desktop app (Nightly channel), Windows 11, Claude provider.

Relationship to #6027 and #2707

This is the same defect as #6027, which was closed as completed on 2026-08-10
— 44 minutes after it was filed, with no linked commit, no pull request, and no
comment. #2707 before it was closed the same way. It still reproduces on
0.0.34 on Windows, so I do not believe a fix for the toggle behavior ever landed;
#6027 appears to have been closed against #2707's earlier closure rather than
against a change.

Cross-platform note: #6027 reported this on macOS and #2707 on macOS, so this is
not Windows-specific.

Workaround

Answer the questions one at a time across several turns, or ask the agent to
re-pose the question as free text and type the multiple answers into the
"Type your own answer" field.