Linux version crashes once you press any button after joining the server:
terminate called after throwing an instance of 'utf8::invalid_utf8'
what(): Invalid UTF-8
Aborted (core dumped)
But it doesn't crash if you launch it again (i.e. you join server the first time, press any button, it crashes, you start KAG again and join server and can play normally)
I'm not sure what exactly determines if it will crash, but it seems rebooting is reliable way to force it to crash again. Also waiting several minutes before restarting forces it to crash the same way
(@jammer312 on discord)