The windmill houses are missing the windmill bearing, and instead there's an unbreakable commandblock, which I need to put myself in creative to get rid of
version 1.20.1 - forge version 47.2.1

Command blocks need to be enabled for the datapack to function properly. If you're running the mod on a server you need to make sure command blocks are enabled in the server.properties file.

It works perfectly, just need to regenerate the world on the server but I see that quickly so it's okk.
Thank you