im using forge 27.0.51 and simple farming 1.0.1'
seeds drop in my single player world but not on my server.
i can spawn in seeds/crops/items in multiplayer, just not seed drops from breaking grass.

I set up a server on 27.0.50 with version 1.0.1 and the seeds were dropping.

Are you using any other mods that might cause a conflict?

https://pastebin.com/114LfzTW is my modlist

I am about to release an update for forge 27.0.53.

If this issue is still occurring, it is temporarily unfixable due to the HarvestDropEvent not being fired for block harvesting. As a result, the loot tables with other mods may conflict. MinecraftForge/MinecraftForge#5828

still nothing, so i guess its a mod conflict? or because the world was generated without it then SF was added later? idk. the trees still generate in new chunks though, its very strange.

Unfortunately, the whole issue stems around Forge still being in an early build. So a temporary solution, I have made is using wild crops that you can break for seeds. This will be implemented in the next update.