Neoforge uses a new naming fule for sand and gravel tags. they now have an 's' at the end.

Sand also has a colorless and red category if needed.
https://github.com/neoforged/NeoForge/blob/1.21.x/src/generated/resources/data/c/tags/item/sands.json

The new update is out and should fix any of these errors I was able to easily catch.

Another Recipe tag error