I think this is a known issue on Google Cloud Run Function, especially when you are using the “Test Function” feature that blocks the user from testing or deploying.

Upon checking the Cloud Run Function public issue tracker, there is an ongoing discussion about the issue. You can also upvote or comment to monitor any updates coming directly from Google Cloud Support and Engineering Team. You can also check the release notes page to keep you updated on the recent updates about Cloud Run Function.

For the meantime, you can try the suggested workaround which is to test the function locally via the functions framework or the functions emulator.