piglins do not pick up gold when mob griefing is set to false
to recreate
Set /gamerule mobGriefing false
Travel to the Nether, since piglins turn into zombie pigmen if in the Overworld
Spawn several piglins, and change to survival mode without wearing any gold armor
Drop a gold item (e.g. Gold Ingot) on the ground.
Spawn wither skeletons nearby, open containers, break blocks of gold, or attack one of the piglins and observe their behavior.
I know it says resolved in java but it is still an issue in bedrock