No matter where you throw gold a piglin won't pick it up unless it is on the same block. This effects piglin bartering farms that work on java but not on bedrock.
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Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-65386, so I will resolve and link this ticket as a duplicate.
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Is mob griefing off? If it is, they will not pick up gold. Mob griefing needs to be on if you want the Piglins to pick up things.