[public-1.13.5] Invisible zombies and spectators being able to be seen

[DabPenBen]

If you are on wifi or have low bandwidth and your game starts to lag due to network issues not game issues like stuttering. Theres a chance that a zombie will be completely invisible make no sound and kill you or you will see spectators flying inside of you or free camming around you depending on their spectator mode

[felis-catus]

Possibly related to #1413.

[DabPenBen]

Would like to add a comment to this due through more experimenting. Zombies that are spawned in and if you go around a corner where zombies are culled? If you drop a couple packets and go around that same corner there is a chance not always but a chance that zombie will be completely invisible. Dropped about 3 packets shown on netgraph. They do however make growling noises but have no shadow no model and are basically completely invisible.

[felis-catus]

Duplicate of #1413