How do i use jigsaws to make random furniture for the inside of a structure (1.20.1)

i'm trying to use jigsaws to make some randomized furniture for the inside of village houses. I got to the point where i tried to actually use the jigsaw to generate something, but it didn't work. the error it gave me had something to do with a starting jigsaw not being in a pool. I tried to generate the furniture using the configuration that every other village thing uses (attached), but to no avail. I even tried looking at the template pool to see if i was missing anything but i couldn't find anything.