@ryantheleach from what i tested. Northing unusual
I’m a bit confused by all this. As @ryantheleach pointed out, properly setting keep-spawn-loaded and load-on-startup would resolve this issue so worlds load and stay loaded.
He did not just want worlds loaded, he wanted to designate chunks to keep loaded so that load-sensitive machines, for instance iron farms and hopper timers, were not broken or desynchronized.