All entities within a chunk despawn upon loading saved game

Steps to Reproduce:

  1. Save and quit
  2. Open the file again

Observed Results:

Every entity within the chunk is gone, including named mobs, villagers and items like armor stands.

Expected Results:

Entities should remain where they were when the game was saved, especially if named.

Additional notes:

This seems to be a very recent bug since I haven't seen anyone else mention it, but it's already happened twice within the last week and seems to occur at complete random.