Subscenes not saved

Hello there,

I basically just learned that you should be able to use scenes in other scenes as “subscenes”. So, I went into Unity, created a test scene, added two other scenes and was happy to see it just seemed to work perfectly.

Imagine my surprise when I came back another day to find that test scene completely empty. After that, I tried it several times again, with different “master scenes” and “subscenes”:

  1. Take an empty scene.
  2. Add one or two other scenes to it, using drag & drop from the project browser.
  3. Try to save the “master scene”, although it’s not marked as dirty after step 2.
  4. Switch to another scene.
  5. Switch back to the master scene again.

Result: The master scene is empty. It doesn’t seem to store the references to the other scenes used in it at all.
Am I doing something wrong? Should this work? Anybody else ran into this and got it solved somehow?

What would be the point in doing this?

Basically, it’s supposed to help manage a complex scene. In my case, it would be nice to use it as a way to separate different sections of a level so different people can work on those concurrently without Collab getting confused. The master scene would then be an easy way to look at the entire picture.
Also, it would help with lightmapping.