Following Timmy's question earlier during the dev stream, I'm here now to submit screenshots of the problem, since you said, you weren't aware of this 'bug'.
The ground floor of the Guild Hall is covered in sandy/dirty patches. They are literally everywhere - Behind the entrance, around the statues, in front of the fireplace, along the walls, in all the corners, between the tables, in front of the staircases, etc. I only took a few pictures as examples.
Upstairs the dirt is not on the floor, but only on the wall above entrance door, where the candles are - those patches are vertical and even glitch down to the entrance itself, where a vertical patch of sand is just floating in the air, when you go into the hall.