Gnome Tweak Tool titlebar not showing up

[Richard Kmausenberger]

The titlebar of the Gnome Tweak Tool isn't showing up correctly some times:
https://pasteboard.co/Jo3fegp.png

(Ubuntu 20.04, Gnome 3.36.1)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-tweak-tool 3.34.0-2ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_5_4_0_29_33_generic_69
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 25 22:43:57 2020
InstallationDate: Installed on 2019-06-22 (430 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-tweaks
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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