The ChunkUnloadEvent is not fired for any chunks when the /stop command is ran, this could lead to plugins that require knowing when chunks are unloaded to save in memory data about the chunk to lose data or have an incorrect representation of their data structure where ever it is saved. 

What I expected to happen:

 When /stop was ran I expected the ChunkUnloadEvent to fire for all currently loaded chunks.

What happened:

  No ChunkUnloadEvent  was fired.