https://bugs.winehq.org/show_bug.cgi?id=39718
--- Comment #29 from mactrix b.adamski@mac.com --- (In reply to Austin English from comment #28)
From that evidence it seems obvious that it was triggered by a change in Steam.
Yes it seems. In this case the issue would also occur on native Steam versions under Windows. So far I don't have confirmation this is the case.