It's not working for me using nvidia graphic card. The only way to work around is to use lightdm instead of gdm3, but I can't login automatically.
I started using Ubuntu budgie in dual boot until the bug is fixed.
I tried Kubuntu and the bug is also in Kubuntu.

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On sept. 23 2020, at 10:51 am, Sujit Kumar <email address hidden> wrote:
> I can confirm this bug is fixed when I updated mutter to
> 3.36.1-1ubuntu0.20.04.1. Using NVIDIA Graphics card.
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1893792).
> https://bugs.launchpad.net/bugs/1892440
>
> Title:
> Shell text with wrong size in mutter 3.36.4-0ubuntu0.20.04.2 (mostly
> on Nvidia)
>
> Status in mutter package in Ubuntu:
> Fix Released
> Status in mutter source package in Focal:
> Fix Committed
> Status in mutter source package in Groovy:
> Fix Released
>
> Bug description:
> [ Impact ]
>
> GNOME Shell starts with a wrong text size
>
> [ Test case ]
> In a terminal run:
> - Xephyr :2
>
> In another one:
> - env DISPLAY=:2 dbus-run-session gnome-shell --x11
>
> The shell should run in the embedded window, with the correct text
> size, running it again (without closing Xephyr window, but stopping
> the shell execution) should not bigger than expected.
>
> -- Other test case (hw dependant)
> - Login, ensure that the Shell text size matches the configured one.
>
> [ Regression potential ]
> Initial UI scaling when fractional scaling is enabled is wrong.
>
> [ Workaround ]
> Run on startup:
> - gsettings set org.gnome.desktop.interface scaling-factor \
> $(gsettings get org.gnome.desktop.interface scaling-factor | cut -d' ' -f2)
>
>
> ---
> See also bug 1892521.
> The package mutter version (3.36.4-0ubuntu0.20.04.2) for Ubuntu 20.04
> causes small text in GNOME Shell menu with NVIDIA cards.
>
> With a previous version (3.36.4-0ubuntu0.20.04.1) all works fine. The problem is after update to the (3.36.4-0ubuntu0.20.04.2).
> ---
> ProblemType: Bug
> ApportVersion: 2.20.11-0ubuntu27.8
> Architecture: amd64
> CasperMD5CheckResult: skip
> CurrentDesktop: ubuntu:GNOMEDistroRelease: Ubuntu 20.04
> InstallationDate: Installed on 2020-08-18 (2 days ago)
> InstallationMedia: Ubuntu 20.04.1 2020.08.15 LTS "Custom Focal Fossa" (20200815)
> NonfreeKernelModules: nvidia_modeset nvidia
> Package: mutter 3.36.4-0ubuntu0.20.04.2
> PackageArchitecture: amd64
> ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
> Tags: focal
> Uname: Linux 5.4.0-42-generic x86_64
> UpgradeStatus: No upgrade log present (probably fresh install)
> UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
> _MarkForUpload: True
> modified.conffile..etc.default.apport:
> # set this to 0 to disable apport, or to 1 to enable it
> # you can temporarily override this with
> # sudo service apport start force_start=1
> enabled=0
> mtime.conffile..etc.default.apport: 2020-08-15T17:44:36
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1892440/+subscriptions
>