Teleporting from a location and back will despawn the entities in the client.
Then sends the entities to the client again. Except the client doesn't render them as the despawn packet was sent in the last 2 ticks.
This is easily replicated by teleporting far enough that the entity is no longer viewable by the client.
Then teleporting back.
Related issues
Comments


That doesn't look to be the same bug..
Same end result sure. Not the same bug.
That's like earning money from doing work and finding money on the street.
You can't call it both the same method despite having the same end result.
This bug is replicable most on a modded server, but can be replicated on a vanilla server.
To replicate on a modded server, just send the spawn packet while the mob is still visible.
Maybe one of the causes of MC-65040