https://bugs.winehq.org/show_bug.cgi?id=39023
--- Comment #15 from Ken Thomases ken@codeweavers.com --- When the game crashes, Wine puts up a crash dialog. If you just click Close, then the backtrace will be written to the output. If you're collecting a log, then it will be in the log.
However, if you click Show Details, then the backtrace is shown in the dialog, instead. It won't be in the log. If you don't explicitly save it to file (and attach that file), then it's lost.