I highlighted three bars on chord sheet (with a vibes RealTrack on a Utility Track selected)...
Then hit Ctrl F8, to regenerate just those 3 bars of the track.
Now ONLY those three bars showed up in the track view or audio edit.
Tried Un-freezing and Regenerating the track,
Tried "Action/Erasing" the track and then regenerating the track...
Still just those three bars showed up.
The only way I could get the whole track back, was to highlight all bars and do a Ctrl F8.
BTW: There were no mutes for the track in the Bar Settings.

Don't know if I did something wrong or if this is a bug.

Thanks!