[Investigating] Magnus doesn't flash impervious when devour is attempted

Platform, device version and operating system:

Screenshot or image:
I have a 1 second video but I can’t upload the file type.

What you were expecting to happen, and what actually happened:
It didn’t flash impervious when I tried to devour Magnus and I had forgotten he was such so I kept trying.

How often does this happen? When did it begin happening?
Every time.

Steps to make it happen again
Using devour on Magnus, I think trying to stun/silence him still shows it.