[Bug 45168] Visual Novel "The Fruit of Grisaia" has flickering glitches

https://bugs.winehq.org/show_bug.cgi?id=45168

--- Comment #2 from Fabian Maurer  ---
Ok, I'm not sure if this is a wine bug anymore. I still think it is though.
"LIBGL_ALWAYS_SOFTWARE=1 wine grisaia" makes the issue disappear.
However, I did an opengl apitrace when the issue appeared, and replaying the
trace does't reproduce the issue. When running "WINEDEBUG=+relay wine grisaia"
it gets incredibly slow, but no glitches as far as I can see.
An idea on how to debug this? Would some kind of detailed log help?