I was having issues crafting the sequenced pulse generator because no stone type would work for it, and after looking through the source code I believe that I've determined the cause of the problem, the recipe calls for the tag "forge:stone", but because this is fabric, forge:stone likely does not exist, thus there is no acceptable item for the bottom row of the recipe.
I'm not a developer, so I don't know how to fix this myself, but I hope this provides insight if you have the time to pursue this issue.
I was having issues crafting the sequenced pulse generator because no stone type would work for it, and after looking through the source code I believe that I've determined the cause of the problem, the recipe calls for the tag "forge:stone", but because this is fabric, forge:stone likely does not exist, thus there is no acceptable item for the bottom row of the recipe.
I'm not a developer, so I don't know how to fix this myself, but I hope this provides insight if you have the time to pursue this issue.
Sincerely, Clancythecat.