there have been heavy problems with async for Small World 2 too (introduced by an asmodee update. it had been perfect before)
matchmaking was shaky and only the player performing the last move could see the final scoring ceremony and standings.
but i think they got it fixed. so Small World 2 is a banner for hope.
Potion Explosion async play is ok.
but bad news for TtR! in our running 5-player game on the France map @Zebracadabra was just kicked from the game with still 3 days on his timer clock. he was running strong and is totally disappointed.
this bug is known since 2017 (see whovian’s comment) but obviously still not fixed.
so we did the right thing to kick TtR from the Decathlon.