NPC mobs summonable when "Education Edition" setting is turned off

The NPC mob from Education Edition can now be spawned with the /summon command, but killing it is impossible, even with the command I used ("/kill @e[type=!Player]", which did still kill cats, but only hurt the NPC).

Edit: Apparently these are only supposed to spawn when the "Education Edition" setting is turned on, while I summoned it when it was turned off. (at least according to the wiki)