Short John Mithril arena NPC sometimes disappears

[Peder Kronsgaard]

https://vanilla-twinhead.twinstar.cz/?npc=14508

https://gyazo.com/caddb8b595a3bc3417fd30e6e43eb0d9

Mary found out that Short John can sometimes bug so he disappears. I can still go to his location with .go creature "short john".