http://bugs.winehq.org/show_bug.cgi?id=37676
--- Comment #24 from q-tan0x q.tanaka@gmx.com --- Created attachment 78373 --> http://bugs.winehq.org/attachment.cgi?id=78373 Log of the crash.
Yosumin (https://store.steampowered.com/app/23300/Yosumin/) is also affected.
winetricks helps for Yosumin (by pulling in d3dx9) and "東方聖戦影 ~ Forlorn Souls of Wicked Past" (for the latter, I can't test, but according to ProtonDB: https://www.protondb.com/app/3138090).
I reported this originally as Proton's issue: https://github.com/ValveSoftware/Proton/issues/8608 . There the dev "kisak-valve" kindly pointed me to this bug.
I attached two logs from the Steam client, cutting irrelevant parts. Here, the log from the crash one.