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
Linked issues
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Is this still an issue in the current Minecraft Snapshot 15w47c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed in 15w47c. Updated listing
Updated listing - still happens through 16w15a
Still happens in 1.9.4, but the title is kind of misleading(unintentionally of course), since entities do still despawn in the next tick, it is just the F3 screen that is not clearing its value.

Dupe of MC-29375
Relates to MC-48375