How do I prevent hidden levels from becoming visible after Datasmith import?

I’m using streaming levels. I have about a dozen levels in the Levels Tab. I’ve turned off visibility for all but the Persistent Level and the level I’m importing a Datasmith file into.

After I do so, all the other levels become visible … even though the eye visibility icon still indicates them being off.

The work around is to click each eye icon on then off again to return it to hidden. But this is annoying and takes time.

I’ve tried locking them … but no luck.

Any ideas?