Uncapped entity spawning after falling into void and idling on "You Died"

If a player falls into the void and idles for long enough on the death screen, thousands of entities will spawn at a very high rate. Graphical glitches remain after respawning (including flashes of mobs teleporting all over the map).

Steps to reproduce:
1) Create a world
2) Set the time to night
3) Dig straight down
4) Idle on "You Died" screen

Eventually the game will crash