If a piglin's inventory is full, it will not try to pick up, run towards or wear gold items, besides Gold Ingots. This may be intended for most items, however it seems unintended that they will still ignore gold armour and weapons, even when not wearing any. They can still wear other types of armour, and will trade their current armour out for something better (if they're not wearing gold). They can still pick up gold ingots and barter like usual.

How to reproduce:

Give a piglin stacks of golden nuggets until it doesn't pick up any more .

Throw any gold item that they'd normally pick up, besides gold ingots. The piglin will not try to pick up the items.