Import Tracks From Project deleting all audio from project window

When working at 88.2 an trying to import tracks from another project, the result is that all the audio in the target project window disappears. The audio is still in the pool but disappears when importing ONLY track data from another project. Anyone had an issue and or found a solution to this? I’ve not encountered this at 44k or 48k before. The only workaround I’ve found is to reimport the project window audio using import tracks from project and only importing audio. Weird.
I’m using Nuendo 11.03 in Mojave on a MacPro