Okay, this happened two times in a row.
Opponent played all cards, I leave one in my hand 'cause I can't reach his/her points.
The next round comes, and they use all the cards again. My opponent auto-passes and the last card comes to me as it should... and I can't play it! The game passes for me as well! One of them was a lost game anyway so it didn't bother me too much, but in the other, I still had the third round before me - but I got a lost game instead!
I'm pretty sure it should NOT work like this... I wasn't here the first time, so I don't know for sure, but as I read the forums, the seasonal modes are the same every month, so I guess this won't be addressed... So I just wanted to warn everyone who reads this:
DO NOT FINISH A ROUND WITH CARD ADVANTAGE!
The game will take it away anyway.