https://bugs.winehq.org/show_bug.cgi?id=40280
--- Comment #6 from compulsorylocales@gmail.com --- Ah, that's great! Thanks for taking the time to check it out!
I just built wine using the code from around 14 hours ago and tried running mirc, and the results are same as what you said: mIRC does not work, but the crash is not reproduced either...
Turns out that clearing out the .wine folder fully and having wine recreate them fixed the crash.
I still have the backup of the one that was causing the crash if needed.
Else, what to do regarding this?