Mouse pointer keeps flashing/disappearing when an external monitor is connected

[Swift Lee]

I'm running 20.04 LTS on Surface Book 2 15',and I connect a external display via USB-C dock. I need to use different scaling settings for different monitors, so I enabled Fractional Scaling. After that the mouse pointer starts flashing all the time, especially in some system apps like settings.
 The internal display is 200% scaling and 100% for the external one.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-01-11 (129 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
Package: gnome-shell 3.36.2-1ubuntu1~20.04.1 [origin: unknown]
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1
Tags: third-party-packages focal
Uname: Linux 5.4.0-31-generic x86_64
UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again.
UpgradeStatus: Upgraded to focal on 2020-05-16 (4 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1879020/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[lotuspsychje (lotuspsychje)]

Please if you file a bug on ubuntu, use ubuntu-bug package from terminal
to pull more relevant system info into your bug and the developers
are able to debug a better way.

You can still apport-collect 1879020 in this stage to pull your info
into this existing bug, thank you!

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

  apport-collect 1879020

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Daniel van Vugt (vanvugt)]

If you can, please also attach a video of the problem.

[Swift Lee (lozap)]

apport information

[Swift Lee (lozap)]

apport information

[Swift Lee (lozap)]

apport information

[Swift Lee (lozap)]

apport information

[Swift Lee (lozap)]

apport information

[Swift Lee (lozap)]

apport information

[Swift Lee (lozap)]

well I have to correct the trigger of this bug
The Fractional Scaling will not cause this problem. Once I connect to an external monitor, the mouse pointer starts flashing.