My world is about 1.7GB.

The problems are probably all related:
1. the oscillating bars when saving or loading do not appear.
2. missing chunks when exploring
3. in-game saves don't seem to occur
4. when saving and quitting, the game reverts back to the original save position
5. when trying to copy the world, a window pops up to say there is no space and I need to free up space even though it is an Xbox One with 500G there is over 300GB of space.