http://bugs.winehq.org/show_bug.cgi?id=58632
--- Comment #10 from Stian Low wineryyyyy@gmail.com --- (In reply to Stian Low from comment #9)
Why proton devs do not contribute fixes back to wine is also an enigma to me.
Source is all available so technically contributed back. Perhaps it's less explicit to avoid wasting time on winehq.