https://bugs.winehq.org/show_bug.cgi?id=37180
--- Comment #32 from MagicMyth mad.magicmyth@gmail.com --- I can confirm the issue still exists on wine 7.0-rc2.
It does seem this issue (plus others) started happening on Windows 10 with modern GPU drivers at some point as well going by the forum thread at:
https://www.epicgames.com/unrealtournament/forums/past-unreal-tournament-gam...
Seems some people found that forcing software rendering got it somewhat working on Windows 10. I tested on Plasma with compositing disabled but that had no affect.