ssh-agent stopped working

It looks like version 8.10.0 has adjusted the behavior. The release notes say:

The SSH agent will now show an “Unknown app” auth prompt for apps that aren’t supported instead of rejecting the request.

Sure enough, I'm no longer seeing failures when I run my test script. Instead, 1P requests my fingerprint significantly more often. The first time I try to sign a commit in a new shell, the prompt is exactly as before:

But on later commit signatures, when I believe it would have failed prior to version 8.10.0, it now says that "op-ssh-sign" is requesting to do the signature:

This suggests that 1P is still frequently (but not always!) unable to identify the requesting app, but is falling back rather than failing entirely as it would before 8.10.0. This is still a better experience than having >50% of my SSH key operations fail, but it does mean I have to authenticate way too often. Unfortunately, now that the SSH operations don't fail entirely, running test scripts to keep trying to track down the issue is marginally more annoying.

I'm not sure if you all do this sort of thing, but feel free to contact me privately if an engineer over there would be willing to investigate this live with me.