Entity discard problem

[bobhenl]

Hello, I have problem with Pufferfish core jar, I'm getting this error when players try to join, any idea what can cause it? Tested with paper and it doesn't happen there:
21.10 03:18:33 [Server] INFO Attempt to teleport removed player Celesth restricted
21.10 03:18:33 [Server] WARN [EntityLookup] Refusing to add removed entity: EntityPlayer['Celesth'/384, uuid='50797f08-0abc-42fb-8b0f-711d78969078', l='ServerLevel[world]', x=0.00, y=80.00, z=0.00, cpos=[0, 0], tl=0, v=false, removed=DISCARDED](Celesth at 0.0,80.0,0.0)
https://pastebin.com/NNFKrPff

[kev626]

You either have a corrupted world, or a plugin doing something very dumb. It's not clear which it is, but neither is caused by Pufferfish.