The game has crashed after a fire was accidentally started in the food store.
After reopening the game, it rolled me back to the previous (14th) day.
I died before I could reproduce this.
Moreover, on the 14th day, the table was missing from the shop and the shopkeeper eventually got stuck in the wall.
1. Play the game 2. Reach day 15th, and the third day of storm/hot season 3. Have a low sanity 4. Enter the food shop and start a fire