Trying to Export video only- get complaint : "Must have 1 media stream" - WHAA?

This feels like a BUG. I attempt to export ProRes422 video, from 1 track, including live action shot followed by a Photoshop nest graphic animation with six layers.

When I leave Edit mode for Export mode, and tell it were to land, I then click AUDIO OFF, then I get this "need 1 media stream" annoyance.

Unexpected behavior.

Best, as always,
Loren