Giving thralls and animal followers food to carry will cause all of the food given to them to disappear or lock in their inventory instantly. This is with thrall and pet hunger turned off.
Steps on how to reproduce issue:
Give a thrall / pet food
Watch it all disappear or lock in their inventory, then disappear
Unfortunately this is the intended mechanic. Funcom coded it so all items that are considered food are immediately “consumed” when they are put into the inventory of pets or thralls.
The non-preferred food items give a hour long 10% combat buff that we can not detect on our thrall/pets.
If it was preferred food items then the thrall/pet gets a hour long 25% combat bonus that we can see as a fist icon on the thrall/pet healthbar when they are in combat.
Yes many have pointed out that entire stacks of food items disappearing from thrall/pet inventories is stupid.