Silas and the other two NPCs can clip through the ground

Repro Steps:
1- Boot the game.
2- Enter the first city.
3- Leave the city via another gate.
4- Return to Silas location.
5- Observe that the NPCs are clipping through the ground.

Notes:
- It happened after I picked up the money from the last character who stays outside the city.
- I couldn't find the save file on my PC.
- Also couldn't send the screenshots here, since the maximum size is 507 Kb.

Had it again today, right after booting the game, but now with Grace Romero. Looks like a global issue.