Just bumping to point out this was partially fixed: Mastery now works correctly when cast, but for some reason it’s STILL bugged when overloaded. I do appreciate that we’ve seen improvement but it’s very frustrating that a card that used to work was broke for so long and is now back to partial...
Replying to reiterate that this bug is still in effect today 12/1 and it makes some decks completely unplayable. The deck worked before the Daybreak migration so I hope Daybreak addresses it soon.