add custom structure (small)

In my datapack I want to add new small structures without any jigsaw blocks (if possible). I scaned a structure called structures/redstone_tower/redstone.nbt. The worldgen folder looks like this: (Picture 1.) The structure folder in the worldgen folder : Picture 2. The Structure_set folder Picture 3. And the Template Pool Folder with the Folder Called "Redstone_tower" in it Picture 4. The problem is that the world is loading and the structure is also locateable and placable with the place command but I cant find it. Ich doublechecked that my .nbt is correct but I think i saved it correct... Would be nice to get some help on my problem