Missing assets in Scene Bundle.

So I have one project where I use addressable to build a bundle from a scene that I added to an addressable group. It works well. I download the bundle and all the assets are there.
But then another project that has the same configuration, a scene under an addressables group refuses to bundle all the necessary assets.
I am trying to figure out what settings I am missing on this second project. I have looked all day. Does anyone have any suggestion on what would cause a bundle to be missing assets?
And how can I debug this?