After some recent update, GNOME Tweaks titlebar is distorted

Bug #1889471 reported by Jarosław Rafa
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gnome-tweaks (Ubuntu)
New
Undecided
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Bug Description

In Ubuntu 20.04, after some recent software update (sorry, I don't know which one exactly), the titlebar of GNOME Tweaks application looks distorted, as on the screenshot below (note the grey bars on the left of sidebar's header and between sidebar's and main pane's headers): https://gitlab.gnome.org/GNOME/gnome-tweaks/uploads/3fc56b8bbc3f390ea8bc0be93d46d3e1/Zrzut_ekranu_z_2020-07-18_23-05-51.png

After I resize the window to make the sidebar disappear, and then resize it back to previous size, the window looks again as it looked previously (no extra grey bars): https://gitlab.gnome.org/GNOME/gnome-tweaks/uploads/5643387a7e3a54379f0211b99149f006/Zrzut_ekranu_z_2020-07-18_23-06-48.png

(by the way, note that GNOME Screenshot application in Alt+PrtSc mode did not capture the whole window and left a transparent part on the right, despite the fact that window is correctly displayed in full, as you can see on the screenshot of entire screen - so something's definitely wrong with that window): https://gitlab.gnome.org/GNOME/gnome-tweaks/uploads/55715b42f1f24bf8640a6fcad3a73907/Zrzut_ekranu_z_2020-07-18_23-08-00.png

After closing and re-opening the application it looks incorrect again, as in the first screenshot.
The screenshots are shown for default Yaru theme, but the same happens for every theme.
This issue occurs under Compiz, does not occur under Metacity (I'm using GNOME Flashback desktop). It did not occur a few weeks ago.

I created a new user to check if something in my config isn't causing the issue - it occurs on a new user account as well.

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