Skybox not displaying. Other oddities.

The game stuttered badly while I was mining. Upon returning to the surface, the Sun was gone and the lighting was dim. The day did not seem to progress. I quit the game and made a backup. The link to the file is at the bottom.

What I expected to happen was...:
Restarting the game would resolve the problem.

What actually happened was...:
It did not. On reloading the world I fell for a few seconds in a sphere that was white above and black below. Then I appeared back in the desert during a rainstorm at dusk. The sun, moon, and stars were not being rendered. The game had one to two second pauses. The problem was resolved when I returned to my bed and slept.

I have confirmed that the backup retains these issues. Link is at the bottom.

Steps to Reproduce:
1. Unzip backup into 'save' folder.
2. Start game and load world '2024'.
3. Enjoy

 

https://drive.google.com/file/d/1Hjvhr_R0zE7-qn0Me4b9CUdOD5I9Lfps/view?usp=sharing