[1.4.3524] Vanilla, no DLC. All "Dark" Carpet Has Disappeared.

[Kilvas]

Loaded the game yesterday, all was normal. Loaded today after the update, all my "dark" (I think it was called that, the dark grey) carpet has been removed and is now soil. The file is pretty old, it may have something to do with it. Red carpet built at the same time is still present.

The center to bottom of the map has hallways with dark carpet and centre red walk ways, these are now red centers with soil around them. The soil spots are the affected tiles.

https://drive.google.com/file/d/1SVAWNtV3Q6gdhfU59cQ2GgjfNxpZNx_K/view?usp=sharing