Sims will suddenly go 'Out of the World' to infinity

I have encountered the same issue/a similar issue.  Sims walk off the map and continue infinitely. Initially, I experienced this while using mods but, as I had a save one minute before, after reloading the game without mods, the issue occurred again immediately.

Steps to Reproduce:

1. Directed a Sim to use the bathroom at a lot in Granite Falls.
2. The Sim walks towards the bathroom, then suddenly turns around and faces a cardinal direction.
3. The Sim begins walking through walls, objects, and terrain directly, continuing infinitely without following the usual path.
4. The Sim eventually disappears from the map.
5. Right-clicking the Sim’s portrait brings the camera to the furthest point in that direction, showing no objects or Sims.

Expected Behavior:
The Sim should complete the action of using the bathroom, without walking through terrain or disappearing off the map.

Actual Behavior:
The Sim walks through objects and terrain, continuing indefinitely. Cancelling the action of using the toilet doesn't resolve the issue. Instead, the Sim queues up actions with objects on the lot (e.g., sleeping on a bed). While the Sim appears in a sleeping state, right-clicking on the portrait shows the Sim past the boundaries of the map, and the bed remains empty.

Additional Information:

• The issue occurred both with and without mods, so it seems to be unrelated to the mods used.
• The problem happens immediately after reloading the game without mods.