Kitchen grunt, the respawner

[Nickorama]

Okay so I'm in the northern block of the prison, with the glass jar,
But I tested the door a few times and whenever I go near the door the grunt re-spawns
I know the grunt is supposed to be there after entering the kitchen with the jar...

I know for sure that it actually res-spawns and isn't just waiting out there. the growl means he spawned.

But I didn't count on it respawning.

Can anyone help? If not I will have to go with the theory:
If you still have the specific object, glass jar, it will respawn, but if you fill it with acid, it won't respawn, anti-trigger would to remove that object. Maybe?

EDIT: I filled it with acid but it keeps respawning.