When I try and a add a jjigsaw based  structure it all ways generates in the void out side of the end islands don’t know why not tried this out side of floating islands type no matter what settings I use I want a end city type gen use it for food not this is a old copy may not work if so I will redo it to match newer versions  normally at y 0 the new version of the pack uses mods but not the version I uploaded found it first in unmodded minecraft