It might be a refresh bug. When using Abh mod with the Athena's necklace part which uses multiple bitmaps overlapped on the roof layer and I toggle ship interior on/off the rotating roof bitmaps don't show up again. Sample ship:
Testing using the upgraded Abh mod you sent me, this doesn't appear to have anything to do with toggling ship interiors, and everything to do with whether the Athena's necklace is operational.
