I had this issue where other faction's settlements wouldn't spawn in on my map. It hasn't seemed to happen this time but I'll put the HugsLib thing here anyways, maybe that can shed some light on what happened. I'll post an updated log if it does actually happen again.

https://gist.github.com/HugsLibRecordKeeper/21c02689009126fa1f6d209a1a0426f1