in settings, window management, window behavior, movement tab, i set 'screen edge snap zone' to 'none', and 'window snap zone' to 'none', and hit apply.
then, when moving the window to the top of the screen (you may have to do this a few times, but i can reliably get it to crash in less than 10 seconds every time), the whole system crashes completely. the screen freezes, and not even ctl+alt+f2 can be used to get to a terminal.

i happen to be using artix linux plasma, and i updated with 'pacman -Syu', which is a full system upgrade, before experiencing this behavior. i didn't try doing these things before upgrading, i'm just saying my system is up to date.