Can't equip CS item "Potion Pot" to auto hp

Probably yet another bug with the new UI.
Does KMS have Potion Pot? If not the new Pet window is probably set to only accept Use items there, no exception for this CS item.

I have a potion pot equipped to my auto-HP, from before, and it still works.
Sorry, not about to unequip it to see if I can re-equip it.

That's fine and i definitely would not ask nor expect you to do that xD