I am exporting the scene and animated cameras as separate vrscene files and open the main scene in vantage and after that import the animated cameras. In 2.3.0 I am not asked about what to import and vantage just opens the animated cameras vrscene, when 2.2.1 asks what to import and behaves correctly.
Check if you have set Dropped Scenes to “Ask” in Preferences.
Ah… Not very intuitive, guys. The dialogue says “Dropped scenes”. And I am importing it. Thanks for pointing that out.