I only skimmed the thread so if I missed it forgive this slightly redundant post.
I usually cook my food and then leave and let it do it's thing and when I need to eat I just click it and eat if from the campfire.
With that in mind on the Advanced campfire I found when I would click and then eat from the food item menu (A Key) I would eat it (animation) but I would not gain anything to my hunger bar. I didn't test all the food since early game but I was eating Scrambled Eggs.
Ate 7 of them till I realized it wasn't filling my hunger bar, was stuck at 58%.
Not a big bug since taking it out and eating from the inventory works just fine.