I have a world where one particular chunk will not save when I exit the world. I believe this world was created in the previous snapshot, But I don't think the issue was a problem until I Optimized the world, as I have the foundation of my structure that saved from before, but any additions are reverted on exiting the world and re-loading it. I am not sure if other chunks are affected, as I haven't built extensively yet.

What I expected to happen was...:
The world should save as normal.

What actually happened was...:
Only one chunk won't seem to save. The screenshot is within the chunk that won't load. The structure was built to the same extent. the diorite indicates the location that won't save.