login screen loses characters in labels

[Andrey Zapariy]

After 12 days of uptime the sequence of locking screen/unlocking screen led to characters missing in prompt of login screen. The hint 'Password' that is written in the password entry field was missing characters as well.
After successful unlocking of a session, some labels and titles on panels and dock are missing as well.
I don't know if I pointed the culprit application correctly.
Attached is the snapshot of the upper right corner of the screen, showing the issue.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gdm3 3.36.3-0ubuntu0.20.04.3 [modified: lib/udev/rules.d/61-gdm.rules]
ProcVersionSignature: Ubuntu 5.8.0-44.50~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-44-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 22 15:27:32 2021
InstallationDate: Installed on 2021-03-09 (12 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2021-03-10T13:49:36.015351

[Daniel van Vugt (vanvugt)]

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 1774053, 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.