I just used the grill and it is definitely buggy.
I put 5 fish in each slot and started cooking.
I took the results out and then put in stacks of 20 fish in each slot. As I placed the third slot they all disappeared before I pressed cook.
Then the previous set of 5 I’d cooked reappeared with the finished dish output again.
I was able to return these to exosuit, only for the second set I placed in to reapper.
Before I could place those back in inventory, the previous set reappeared again. I tried to activate cooking when the large stack set appeared again but it stopped cooking in a few short seconds when the input reverted again .
It makes a pretty glow for night time fishing though, that first time it worked.
Resummoning did not fix it.
Oh and I discovered after that all those fish I pulled were getting duped. So now I have 100 of some fish types 
I’m hoping to find a food type for the Nutrient Ingestor that gives a boost to fishing on top of the lure boost. That would be very welcomed 