Gummy Bears will not accept any modded potions that use NBT to generate their potions, such as Amendments' Mixed potions or Incendium's loot potions

(They also do not accept any potions with immediate effects, despite stating in the cave compendium to work with "any kind of potion" but that applies to some vanilla potions and seems to be intended behavior. Probably worth changing the cave compendium for though)