https://bugs.winehq.org/show_bug.cgi?id=54441
--- Comment #5 from François Gouget fgouget@codeweavers.com --- Flaky would mean it's an unavoidable behavior caused by external factors which, if I understand correctly, does not seem to be the case here.
This sounds like more of a Windows bug (particularly since it seems only specific Windows versions exhibit it) or at least an undesirable behavior, so broken() may be more appropriate.