Fishnet version 4.6.8
Basically when removing ownership from an object and despawning it in the same frame(tick?) causes this warning. The method to remove the ownership and despawn is called from a serverrpc.
One workaround I found was to add a predicted spawn component to the object, send a targetrpc from the serverrpc to PredictedSpawn.Despawn().
Am I doing something wrong?