In AudioEdit View, on the Master Track, Using Volume Automation...
I faded out the end of the tune from Bar 40 to Bar 43.
But, instead of following the volume automation, it actual started fading at Bar 23.

I highlighted all nodes (Control A) on the on the Master Track, deleting all nodes, and audio returned.
Tried again, with same results. Guess I'm just having a bad day. frown