Minecraft Realms: Individual chunks not saving build progress and/or resetting

Upon logging into my Minecraft Realm and loading chunks that were modified by other players while I was not logged on, the chunks revert to the state that I last loaded them in, often undoing builds or other changes made by the other players.

What I expected to happen was...:
Any builds and/or world modifications made by other players should be persistent among all players and across all logins.

What actually happened was...:
Upon logging in and loading a previously loaded, but currently unloaded chunk, the chunk reverts to a previous state.

Steps to Reproduce:
1. Player A and Player B log into Realms and load a chunk simultaneously. 

2. Player B travels far enough away for the chunk to stop rendering for them then logs off.

3. Player A modifies the chunk in survival mode (building, mining, etc.) then logs off.

4. Player B logs back in and returns to the initial chunk.