No no no no 
What @DaVice was trying to point out is that there’s a high probability you haven’t read the patch-notes… Where the ancient bug of thrall-pots has been finally fixed. Thralls will ONLY take food from the pots if they are missing health now.
If that’s what you’re experiencing, then this is not a bug.
Continuing the discussion from 
PC Update 3.0 (2022.09.01): The Age of Sorcery [Latest: 3.0.2 (2022.09.13)]: