https://bugs.winehq.org/show_bug.cgi?id=57635
--- Comment #1 from wine@xarov.net --- The UI elements still exist underneath the black window, as the mouse cursor changes to a hand and finger when hovered over those elements. They're clickable too.
If I click exactly where the "Play" button is for World of Warcraft, the game launches and it's using the Wayland driver. No issues playing the game, both keyboard and mouse inputs work.
Just the launcher is black, that's the issue.