When piglins hunt hoglins, it drops pork and leather. Baby piglins can pick up both, will despawn when holding porkchops, but won't despawn when holding leather. This often fills the crimson forest with baby piglins, and may cause performance issues over time.
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Did some testing and it seems that any non-gold/porkchop item a baby piglin picks up will set their PersistenceRequired
nbt tag to 1b.

Somewhat related, but there's this ravine near my house that is filling with zombies that are picking up items from mobs dying because they walked off the edge of the walls of the ravine. Is there a separate issue for that?

can you clarify on what the fix for this is? I've known they get persistent from picking up any item except for golden stuff, (see https://bugs.mojang.com/browse/MC-194720 ), as well as that all piglins can pick up loot. Is it that piglins can only pick up gear now?

Mojang should ensure that items other than leather still properly set this flag. It would be unfair if a baby piglin would steal your items and then despawn.
Hi there!
I can confirm.