For people following this with the release of iOS 16.5 it seems like whatever was the problem was on Apple's side and is fixed. Still seeing the crash on 16.4.1 devices but only on 16.4.1 and the total rate has gone down significantly.

We're only using it for a platform login option. It does look like the crashes are all happening when the app is backgrounded. Can anyone else confirm that?

No updates other than it continues to happen and continues to be a 16.4 only issue.

This is now the single most common crash on all of our iOS users. As mentioned it was fixed and then regressed.