I made a gold farm in 1.15 and it worked well, I got gold and gold nuggets but when I updated to 1.16 they dropped only swords.
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Hey - I found this one when searching for fixes: MC-193121
We updated our mod pack and now Zombified piglins drop all loot - hope that helps.
I'm having the issue in 1.16.1 on a Realm server (if that makes a difference). The one I built in my test world (single player) works fine.