Hi Asyn.
Avast Premium 20.1.2397 (build 20.1.5069.562)
No other security software
And I am not willing to try the latest beta

But - playing devil's advocate here - if I were to disable self-protection, delete all defs up to yesterday inclusive and edit aswdefs.ini to reference the first actual def update for today, how safe (or otherwise) would that be?
About Avast is showing the latest installed def as 201014-0, but the "outdated" notification persists.