I had seen this scene, showing a Guild Heighliner, in many clips from Dune (e.g. this one), but hadn’t paid close attention to its interior.
I think what we’re seeing (or, supposed to be seeing) is “the other planet” at the end.
If true, this is a clever re-imagining of the structure of this giant “carrying-ship”; instead of showing it vanishing-then-appearing, it shows it bridging the two planets.
This is what you’d expect if it had folded space.