Problem with the Dock setting of "Show on" uses all Monitors instead one

[David]

I use a Laptop with 2 external monitors.

When I first entered the Appearance tab in the settings, it was set to Built-in display and the Dock was shown only on the Built-in display as expected.

I messed around with the setting and tried out on "All displays". No I'd like to switch back to only Built-in display or an other external monitor.
When i choose an external it automatically switches back to "All displays".

If i choose "Built-in display" it stays there, but nothing is changed. After switching to an other settings tab and back it's again on "All displays".

I can't set it to anything else then "All displays" now and I'm stuck here and can't change it at all.

This appears to happen with Ubuntu 20.04.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.1-1ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed May 13 15:23:34 2020
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2020-04-29 (13 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Paul White (paulw2u)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1866088, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report.

Feel free to continue to report any other bugs you may find.