I could be wrong but Im pretty sure you don’t need to add your new fabricator to that list. Also, the way you have it set up it looks like the new items you added would be craft-able in the old fabricator as well the new one. Maybe that’s what’s buggin it out. Trying to override 2 different items with the same items? Your fabricator & new item engrams need to go in the “additional engram blueprint classes” section and all your new items that are crafted in it go into that structures primalinventory_BP.
Unless you already have the new fabricator on another mod and are trying to override it with a newer version.
2 totally different things here. His items are under “Additional structure engrams” which is where you put new items that you want to be craft-able in a crafting station such as the fabricator.
Your screenshot shows “Additional structures to place” which is where you put new items that need to be placed like walls or a new fabricator and such.