Unload Stream Level Not Removing Dynamically Spawned Actors

Dynamically spawned actors do not seem to be removed when unloading a streamed level that they were spawned into.

1. Open the attached project
2. PIE (Notice the red cube that appears when the Sub1 level is streamed on begin play)
3. Wait 4 seconds for the Unload Level node to get called.

Result: Notice the geometry behind the floor disappear when Sub1 is unloaded, but the dynamically spawned Red cube does not get unloaded with the level

Expected: The dynamically spawned cube would be removed when the level it was spawned in was unloaded.