ill repeat this since u did not see it the first time , "they will only produce mana when NOT overfeed " so if they are over eating u get 0 mana period from them until they cool down and they only can only cooldown when there not overeating, cooling down takes over a minute(5 mins to be precise) if they overeat at any point during cooling down they restart cooling down .For the cursed earth the room was completely dark, i used dark glass to build it so i could see it wasnt working, as for the thermalillies the over eating is fine but they weren't making any mana
i dont think either of the 2 lamps i mentioned care what blocks are in the way , the project red ones had there weird property even when turned off