changed title from quicklists / right-click on dash to see recent documents not working to quicklists / right-click on dash apps to see recent documents not working
changed the description
added 3. Not GNOME label
You'll need to file Ubuntu bugs in Ubuntu's issue tracker. If you can reproduce in a pure GNOME session (not an Ubuntu session) with zero extensions, feel free to report them in GNOME's issue tracker.
closed
To expand on what Andre is saying: Ubuntu uses an extension (dash-to-dock) to replace the upstream dash with its own version. Recent files are exclusive to that extension, they are not part of the upstream dash.