I have a gold farm as well in the nether and I have tested it without any other players online on my server and 20w17a breaks it. I get only about 10 pigmen per minute while in 20w16a I was getting hundreds. I took a backup of the server on 20w16a and loaded it into single player and the farm was working fine but when I updated to the latest snapshot it was broken again. It is either a bug or there is some intentional change to spawning in the nether. Possibly a change to spawning above the bedrock ceiling?
I have a gold farm as well in the nether and I have tested it without any other players online on my server and 20w17a breaks it. I get only about 10 pigmen per minute while in 20w16a I was getting hundreds. I took a backup of the server on 20w16a and loaded it into single player and the farm was working fine but when I updated to the latest snapshot it was broken again. It is either a bug or there is some intentional change to spawning in the nether. Possibly a change to spawning above the bedrock ceiling?