phw

I disabled (not checked) showing the Documents folder in Finder preferences:Sidebar → Spotlight and Alfred ARE NOT able to reveal files in Finder column view.

Re-enabling (checked) showing the Documents folder in Finder preferences:Sidebar → Spotlight and Alfred ARE able to reveal files in Finder column view.

Hope this solves the issue for others. 

Ahh … all volumes are on the same physical volume. Mystery solved.

Is there any way to eject child volumes separately when all do live on the same parent volume?

Alfred's preferences for System:

• eject is checked
• local mounted volumes is selected
• eject all is unchecked

On invoking the eject keyword, I see the list of local mounted volumes.

Selecting, say, #2 and hitting return/enter, Alfred ejects all volumes rather than just #2.

Behavior does not change if Mounts in /Volume is selected from the dropdown.