Summary: When breaking every block in a chunk so that it only contains air blocks, the blocks reappear upon moving away and returning, or after exiting and re-entering the world. This prevents the creation of void worlds such as for skyblock or skywars.

Tested in the overworld, nether and end.

Observed Behavior: Chunks containing only air blocks do not save changes, causing any modifications to revert upon moving away or reloading the world.

Expected Behavior: Chunks should save changes regardless of containing only air blocks, maintaining any modifications made by the player.

Steps to reproduce:

1. Remove all the blocks from a chunk, including bedrock.
2. Exit and re-enter the world.
3. Observe the blocks, or some of the blocks, being back at their position before being removed.

Or

1. Go to an already empty chunk. It can be in The End or in a world generated with only air blocks.
2. Place any block.
3. Exit and re-enter the world.
4. Break the block.
5. Exit and re-enter the world.
6. Observe the block being back at their position before being removed.