Several builders in M54 are failing since Sep 27 during cleanup phase

Force build work for some (e.g. Master) but the failures comes back in the next build. Seem like git update issues 

Any recent change on these scripts?

Log snippet:
@@@STEP_FAILURE@@@
07:43:23: ERROR: <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 1; command: git update-ref -d patch_branch
error: refusing to update ref with bad name 'patch_branch'

Full logs:

@@@STEP_FAILURE@@@
07:43:23: ERROR: <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 1; command: git update-ref -d patch_branch
error: refusing to update ref with bad name 'patch_branch'

shuqianz@, seems like you are deputy this week, could you evaluate/forward as needed?

This is currently blocking our M54 Beta releases since multiple images are missing