Okay okay, found the problem, magisk manager needed to be 5.x series. Because the magisk is 16.x. So installed older manager, and works like charm.Okay, I think I messed up something, need a little help.
I wiped data, cache, dalvik.
Needed to reinstall magisk, installed 16.0 zip instead of modified one 16.3 by faizauthar.:silly:
Installed magisk manager, app crashes.
Again installed 16.3 zip, app crashes.
Flashed uninstall magisk, gives error.
Device- of course zuk 2
Rom- aex 6.0
Everything else stock as far as I remember.