Piglins will not barter with ingots on the ground or dropped from dropper

I was designing a piglin bartering farm, but there appears to be a bug that makes it so that they don’t pick up gold that’s is on the ground. Instead, the player has too give it to the piglin by left/right clicking. This is very annoying, how ever, the weird thing is that it only happened on super flat worlds(in the nether). I tried it on a normal world, and it worked perfectly. 

how to recreate 

1. Create a 1.19.2 super flat world
2. go to the nether 
3. find or spawn a piglin 
4. drop gold
5. watch at they DON’T pick it up as they are supposed to.