[Bug]: New worktree UI briefly stores correct t3code branch, then overwrites thread branch back to develop

[MichalGreliak]

Before submitting

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

Area

apps/desktop

Steps to reproduce

1. Open an existing project in the T3 Code desktop app.
2. In the composer UI, use the "New worktree" control.
3. Leave the base selector set to "From develop".
4. Send a prompt so T3 creates a new worktree/thread.
5. Push the generated t3code/* branch and open a GitHub PR for it.
6. Return to the T3 sidebar and check whether the PR icon appears for that thread.

Additional context:
The worktree was created from the T3 composer UI using the "New worktree" option with "From develop" selected. I did not create the worktree manually with git CLI.

The project does have an auto-run setup script for new worktrees, but it does not switch branches or create worktrees. It only prepares the local development environment after the worktree exists.

Expected behavior

The thread should keep the generated worktree branch, for example t3code/abc12345.
If that branch has an associated GitHub PR, the sidebar should show the PR icon.

Actual behavior

The worktree is created correctly and the actual git branch is t3code/abc12345, but the final projected thread state stores branch=develop.

Because the sidebar matches PRs using thread.branch, T3 looks for a PR for develop instead of the actual worktree branch, so the PR icon is missing.

I inspected the local T3 state DB and saw two thread.meta-updated events emitted almost immediately:

Correct event:

branch=t3code/abc12345
worktreePath=/Users//.t3/worktrees//t3code-abc12345

Then about 10ms later:

branch=develop
worktreePath=/Users//.t3/worktrees//t3code-abc12345

The final projected state keeps branch=develop, even though:

git branch --show-current

t3code/abc12345

And GitHub CLI can find the PR for the actual branch:

gh pr list --head t3code/abc12345 --state all

returns the expected PR

Impact

Minor bug or occasional failure

Version or commit

0.0.24-nightly.20260510.249

Environment

macOS, T3 Code desktop app. GitHub CLI is installed, authenticated, and available in the app server PATH.

Logs or stack traces

Screenshots, recordings, or supporting files

Zrzut ekranu 2026-05-11 o 11.30.37.png

Workaround

Manually correcting the stored thread branch to match the actual git worktree branch makes the PR icon appear.