So 😅. Thanks for sharing the error log. To me, deprecation notices cannot be the source of your troubles. For bbPress you need BP Classic as it’s not ready for BP 12.0.0. I submitted a patch to their Trac env. but it has not been committed yet.
Even if BP Classic is active, your links are logging you out?
There’s only 2 way to get this behavior, the links are containing the logout URL, or some code is redirecting the page after logging you out.
Next step would be to rollback to 11.4 to see if the bug has disappeared. But if it’s the case I’d be surprised.
