Structure troubles in custom dimension

I'm having some issues with getting structures and features in my custom dimension to work, specifically at the moment, villages.
Basically they don't generate and I think It might be due to my dimension being quite high coordinate wise (about 66-400). I've set the start height up up to 292 so I'm not sure what else would be stopping it.
When I try to place in a village (or some features for that matter) I get "That position is not loaded" and when I execute the command at myself i get nothing, no chat error and no placed structure. Any ideas what I might be missing?