Things seem MUCH better, but not completely solved. Could be a tiny regression with NetworkManager Applet's icon on notification - unsure (and not being able to shut notification is old, and allegedly an old upstream tiny bug), but that icon issue could be a thing I just didn't notice before.
Elaborated on Dev channel as was asked to test (meant on Support channel); still having an OOPS (non boot) budgie menu's wrong language's search issue after panel auto refresh bug, and it seems the logoff -> relog issue is not COMPLETELY solved (tried on a superfast relog for testing purposes).
The boot language indicator's bug is seemingly solved!
Overall for me it seems a good update! More responsiveness, some issues solved and no NEW major issues I see. However as said, I think not all PREVIOUS critical bugs are solved.