https://bugs.winehq.org/show_bug.cgi?id=57098
--- Comment #7 from Fabian Maurer dark.shadow4@web.de ---
Can't be staging, because it happens with pure 9.16 and 9.17 too.
Obviously, because vanilla wine doesn't have a WRITECOPY implementation to begin with. Staging has one, but it broke due to an update. Or intentionally, since the hack was removed.