Primary Bug Report General - Settlement happiness will not go above 65% and plots will not upgrade

[DirtyBlue929]

So this is either a bug report or a request for advice, or maybe both? I was wondering why none of my settlements ever seemed to upgrade their plots and figured that it was probably due to all of them being between roughly 65%-45% happiness. I don't have any mods installed that should affect happiness other than maybe the creation club items that give a happiness bonus. All my settlements have their needs met for food, water, homes, recreation, and work, but their happiness just... stays static? So either I'm missing something obvious, or there's a bug keeping it from increasing. Feedback would be appreciated in the former case, lol.