Cannot trigger workflows manually targetting a copilot agent branch

Describe the bug
When attempting to trigger a workflow manually using workflow_dispatch and attempting to target a specific branch, copilot branches are always missing in the list.

To Reproduce
Steps to reproduce the behavior:

1. Give Github Copilot agent a task on a repo with a workflow_dispatch workflow file
2. Attempt to run the workflow/action manually targetting the copilot branch
3. No results

Expected behavior
I should be able to run actions manually targetting a copilot branch, just like I can approve running automatic workflows on their branches/PRs

Runner Version and Platform

Don't think this is runner specific, I couldn't find a "Github Web interface for Github Actions" repo honestly.

What's not working?

No error, just the branches are not targetable

Job Log Output

No log output, because job cannot be run

Runner and Worker's Diagnostic Logs

N/A

The issue names no runner files, tests, or entry points and suggests the behavior may belong to the GitHub web interface rather than this repository. First verify ownership by reproducing the workflow_dispatch branch selector with a Copilot agent branch; done means confirming whether that branch can be selected and the workflow can be run manually.