User report on git 2.55.0

Hi,

I recently bumped to the latest version of git on macOS via homebrew, and here's what I've noticed:

1. git-replay now updates the ref, simplifying my git-reply-checkout script. Someone on this list recommended it to me in response to an issue I had a long time ago, and I think I can safely say that git-replay is an invaluable tool. Thanks!
2. git-pull often fails with a dangling remote ref error, and fails to update the current branch (main, in my case): the workaround is to reset-hard to origin/main. I'm not sure if this is a GitHub issue, or a bug in core git: I've never encountered this behavior on older versions of git, with the exception of submodules.
3. git-diff sometimes exits with 0 code without printing a diff, even though the worktree is dirty: the workaround is to run it again. I've never encountered this behavior on older versions of git, and I think it might be a subtle race in core git.
4. `git checkout -` sometimes fails with an invalid ref error after a pull, where the previous branch is a local branch. I don't know if this is due to a background git-gc with some behavior change, but I never encountered this behavior on older versions without an operation that would cause this.

Before digging further to find the root cause, I'd like to know if there is some explanation I'm missing, or if these are known issues?

Thanks.

Warm regards, Ram