Hey! Great mod, love the options.

I was playing with the leaves yesterday and when I came back several of the leaf stairs had turned into dirt. I didn't use slabs, so I don't know if they have the same issue.
I think I used oak or dark oak leaf stairs.
I retested it later on and the same happened.

If it is useful information: the stairs were upside down

Well that is strange, Ill look into it. Are you running Forge or Fabric?

I'm running fabric