https://bugs.winehq.org/show_bug.cgi?id=52272
--- Comment #2 from faalagorn@gmail.com --- Apparently, it seems the situation improved, at least it seems so with a quick test of 7.0-rc1 staging. The client seems to no longer crash. It sometimes flicker slightly, but clicking buttons seem not to crash the game and the colors seems to have improved.
I'll report back if I'll have more info, but feel free to take a closer look.