The resort is one of the ones that came in IP, not one that I built or that my active sim owns. It's been open and active in other games I've played there, so I know it doesn't have any inherent routing issues. I didn't check for social jigs or other invisible things, because I've never seen anyone there in this game. Of course, I was busy with my sim underwater much of the time, earlier in this game, so it could have been active previously.
Next time I'm in my game, I'll check the lot with MC, and see if there's anything there that shouldn't be. But wouldn't bulldozing and replacing it already have taken care of anything like that?
And by the way, while on the subject of resetting with MC, does resetting everything in the town fix issues like that with all of the community lots? I do that once each sim week, and I've also started doing that in IP every time my game starts freezing, after checking my sim's collection helper to make sure it's set to "none." I did it in the same play session in which I tried to fix the resort, but I don't remember whether it was before or after I bulldozed and replaced it.