Grass randomely needing manure

Hello @Snom the great, welcome to the forums. There's very little to go on with what you've reported. For starters, since you said you just joined a random world then it could be due to mods added in by the server hosts/admins. OR someone actually dug up and replanted grass to troll the server. OR many other reasons.

If you are experiencing this on your own self-hosted server without any mods, then that would be an issue. If you could provide more info, that would be helpful. Cheers.