[Gameplay] Azir Passive bug

I was playing with a friend in a normal and he said that all the towers including the Fountain had the icon for summoning the turret. I thought at first i thought it was a visual, but he went to place it in base and it actually summoned. It also couldn't be destroyed since it was being healed by the fountain, so he had half his passive gone.

I have no idea how to recreate it, because he just said all the towers randomly had the icon.