Unable to change text-scaling-factor on gnome 3.30.2

Question

On debian (testing) with gnome 3.30.2 I am unable to change the text-scaling-factor to 1.25. Neither the tweak-tool nor using the gsettings command works: As you can see on the screenshot the plus option is grayed out.

Using this command:

gsettings set org.gnome.desktop.interface text-scaling-factor 1.25

I get this error:

The provided value is outside of the valid range

Using the command line I can set the scaling factor to something equal to or below 1, but every value greater than 1 gives me the above error.

I am absolutely certain I was able to do this a few days ago. I do not remember installing any updates since then. Several reboots and logouts did not fix the problem. I would like to avoid uninstalling/reinstalling software since this is a relatively new debian install and I doubt it would help.

uname -a:

Linux T470s 4.19.0-5-amd64 #1 SMP Debian 4.19.37-3 (2019-05-15) x86_64 GNU/Linux

Are there any logs I can look at to see what's wrong? How can I make that option available again?

I have tried turning the "Large Text" accessibility option on but that didn't help either.

The file in /usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml contains:

<key name="text-scaling-factor" type="d">
  <range min="0.5" max="3.0"/>
  <default>1.0</default>
  <summary>Text scaling factor</summary>
  <description>
    Factor used to enlarge or reduce text display, without changing font size.
  </description>
</key>
<key name="scaling-factor" type="u">
  <default>1</default>
  <summary>Window scaling factor</summary>
  <description>
    Integer factor used to scale windows by. For use on high-dpi screens.
    0 means pick automatically based on monitor.
  </description>
</key>

Answer 1

It seems that even though all the configs were right, the only solution was to reinstall Debian. It now works like intended. I suspect a gnome extension to remove the accessibility menu had something to do with it.