https://bugs.winehq.org/show_bug.cgi?id=35207
--- Comment #30 from Andrey Gusev andrey.goosev@gmail.com --- (In reply to Paul Gofman from comment #29)
The issue is still reproducible. Driver 415.27, wine-4.2-118-g812d03129d
With the attached patch the white squares are present. (In case the commented block should be commented)