Ah yeah, that’s a fairly long-running one - seems to be server dependent from what I can see. There’s too many links to posts mentioning variations of it for me to link here, but if you check Legacy bug thread 1, and use ctrl-F to search DBNO it’ll come up with “Follower thralls have 1-3 strikes (DBNO) upon placement or purchase as well as after server resets and if killed it will be permanent - Since January 30, 2025” as the second result, and all the links are under that.