The change in there is:

  Restore patch from 1.20.0-0ubuntu3:
  * Add debian/patches/terminate-session.patch: Terminate leftover processes
    in greeter session. It can happen that the greeter session does not
    properly clean up itself on logout. This causes leaked processes like
    settings-daemon which act on the user session as they share the same
    $DISPLAY. Ask logind to terminate remaining processes in the greeter
    session on closing, which is more robust than trying to fix every greeter.
    (LP: #1637758)

 -- Martin Pitt <[email protected]>  Tue, 22 Nov 2016 09:43:39
+0100

Which suggests that the issue might be lightdm-gtk-greeter being killed
before the unlock has completed?

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https://bugs.launchpad.net/bugs/1656399

Title:
  Unable to unlock Xubuntu XFCE session after suspend.

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