I too have this interestingly annoying problem.
I created a new M&P.
I created all 13 new items to be crafted, the engram and the consumable BP. (these are based on the Narcotic BP’s)
All have the requirement to use the new M&P’s Inventory.
I referenced these in the new M&P’s Inventory BP.
I referenced these in the new M&P Component Tab.
I referenced these in the PrimalGameData: Additional Engrams and the Additional Structure Egnrams (under the New M&P)
Everything works great, until you go to craft something. There’s no CRAFT buttons in the structure.