Cannot discard manually from hand. Specifically, arachas nest .
Could not attach the video, so video by link.
https://drive.google.com/open?id=1zrki2vKe1lMscWX6bRmQkkfezEzJf3Uz
I won a game, and it showed visually rank 30 for me, even though I am rank 2. Additionally I checked and I received no piece of mosaic avatar.
Edit: very sorry for the post, after restarting the game twice, I received the mosaic piece.