It is probably
bug in combination with Onyx firmware 4.1 and Magisk.
If even APatch does not work for you, there is something strange.
I have Palma on 4.1.1 and Magisk works without issues. I would expect I will have same issues since software should be similar.
Can you try to enable Magisk to
run in background? On Note Air series menu will be probably little different.