https://bugs.winehq.org/show_bug.cgi?id=53114
--- Comment #7 from ryu.ketsueki@outlook.com --- (In reply to Rafał Mużyło from comment #6)
AFAIK, wine doesn't have a pure wayland backend and (as you've mentioned yourself) KWin - so a XWayland case, meaning still winex11.drv.
Anyway, my initial guess would go along you providing WINEDEBUG="win,event,x11drv" output (likely someone else could suggest a better selection of channels, but these seem a good start).
Following your instructions, I added that WINEDEBUG parameter in the environment before running the app again and this is the output I got. I saw lots of fixmes (which I assume are not related) and traces, although this time there was something different at the bottom, two X Error of failed request. I ran this on KWin. I'll make the same test on TWin as soon as possible to make sure it is the same cause.