The Pitt road before the gate has bugged collision

[FiftyTifty]

For some reason, the collision for the road before the gate is bugged; the player will fall through but not entirely, so that their chest is clipping with the road. This didn't happen the first time I walked on it, but after making a save nearby and reloading it, the collision is bugged.
Picture of the issue: https://i.imgur.com/Ab1WaoC.jpg

Edit: After restarting the game, the issue does not reoccur. Odd.

[RoyBatty]

Occasionally havok will just stop working in the game, I've experienced this on three occasions over the years. It's a rare engine bug,