I've reported that bug many years ago, here is one old thread talking about it:
https://forums.mirc.com/ubbthreads.php/ubb/showflat/Number/223541/ from 2010 (but the bug had been reported before)
This bug is still unacceptable 10 years later, it does corrupt your mirc.ini by just taking a simple nick such as fstatus, this is the most basic and annoying exploit that exists in mIRC
And the fix is extremely simple, just add a prefix to the item in mirc.ini which contains a character that cannot appear in nickname, such a ':'.
