[MC-172516] Piglin/hoglin become Persistant when within 16 blocks of a player, causing massive lag due to piling up entites

The bug

If a piglin or hoglin is within 16 blocks of a player, they get the PersistenceRequired:1b tag, making them unable to despawn and no longer count towards the mobcap, which results in thousands of mobs beeing alive in the nether and never despawning again.

Linked issues

relates to 2

MC-173266 Hoglins can despawn Resolved

MC-187451 Hoglins will despawn even after breeding, making breeding pointless Resolved

Comments 3

violine1101 2020-02-16T20:54:05Z

Can confirm. Might be intended (bar the performance hits of course) in order to keep hoglins and piglins around.

A potential fix might be to count for how long the piglin/hoglin has not been near a player, and if that value is above a certain threshold, remove the PersistenceRequired tag again.

Irbis 2020-02-16T21:22:04Z

IMHO:

PersistenceRequired should be triggered only when Hoglins were fed, leashed( ? ) or bred (baby).

For Piglins only when they picked up at least one item (except gold nugget, but gold ingot should count).

Jack 2020-02-16T21:25:28Z

i dont see how this would have any effect on bartering with them... they become persistant if a player is within 16 blocks of them, mobs can only despawn if further than 32 from a player. and afterall theres no way that mojang intends players to accumulate 1000s of mobs in the nether over time