The latest beta for an S21 plus series? Don't you think that's why it crashed? From what I know beta versions for Android 12 ended so last year, I could be wrong. If I am right, I advise you to update your phone to the current stable version of Android 12.
I doubt anyone else uses the beta which you can expect to have issues. Is there a reason you haven't updated? There have been a number of updates to Android 12 since launch and you've missed all of those.
I'd ensure that you've got the latest version of the Wearables manager and plugin installed - even go as far as deleting the current app and then installing it afresh before reconnecting your buds back. I was on the A12 Beta programme. Moved to stable release and multiple updates since - my BudsPro weren't affected at all.