Same thing here. Took me a while to figure out what was wrong but disabling sim settlement fixes the issue.
Question, in my new game I have only activated sim settlements and so far I have no built anything related to sim settlement. So I am thinking of simply disabling the mod, completing the quest and then reactivating the mod but I am a bit worried about future possible bugs. Anyone has any idea if it could cause problems in the future.
I don't suggest doing this if you value your save, disabling a mod mid-playthrough, especially one as big as Sim Settlements, is a quick way to save issues.
kinggath is aware of the issue, if you're unwilling or unable to use the console command, I'd suggest waiting for him to release the fix.