Ubuntu launcher/dock is visible and operable after screen lock

[Jeff]

Didn't notice this yesterday, but left my machine running over night and this morning when I went to log in, the application bar on the left was visible. I tried clicking on items on the bar and it launched those applications. If someone had a privileged script or app pinned to their task bar, it appears that anyone could launch it. The window isn't visible however.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: nautilus 1:3.26.4-0ubuntu7
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 21 09:29:03 2018
ExecutablePath: /usr/bin/nautilus-desktop
InstallationDate: Installed on 2017-10-07 (379 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcEnviron:
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: Upgraded to cosmic on 2018-10-19 (1 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Simon P. (simpre)]

I can confirm that bug since the upgrade to 18.10. Sometimes also the field to enter the password is missing on the lock screen (see attached picture).