Fabric 1.20.1, mod version carryon-fabric-1.20.1-2.1.2.7

Initially encountered picking up goblin traders in the nether - teleporting back to my overworld base (using /home) and then placing them down they would just disappear (as in, they were in my arms just fine but vanished when I placed them). I thought this was just a problem with the goblin trader mod, but then today I picked up a trader llama in the overworld and teleported home, and that vanished too.

No other mobs seem to disappear - I've spent an hour flying around the overworld to try and find a normal llama to test that but no luck.

I've gone into a single player world to test it there and neither goblin traders nor trader llamas disappear when placing them after teleporting.