Sims moved onto a new lot won't move or do anything

I spent almost a year away from The Sims 4, but finally had the itch to play again recently. However, after completing all the updates, I loaded into a new save file and started a Scenario, and when I loaded the family onto the lot they would only move so far, wouldn't actually interact with anything or anyone (despite the queue showing they're playing a video game, watching the weather, or having a conversation - none of which they were actually doing). Then a royal envoy arrived, and I tried to get the Sims to talk to her, nothing happened. I closed the game, deleted the cache, reloaded the game, and the envoy had duplicated herself at two different ages (young adult listed as the envoy, original envoy simply listed as adult) and one of them was "dancing" with one of my Sims who was supposedly playing a game on a laptop while actually standing at the front door "dancing" with the former envoy.

I've never seen a game this broken...and I'd really appreciate a fix before the itch to play disappears.

I have no mods or CC. On PC. Version 1.121.372.1020 dx11