When the system updates mutter-common and some related packages, it replaces the downloaded versions that you installed and causes the GSettings key clip-edge-padding not found in schema org.gnome.mutter issue.
You should be able to resinstall mutter-rounded to fix the issue.
However, the problem will appear again if a system update replaces these packages. When this happens, you will simply have to reinstall mutter-rounded again.
There is a workaround below but keep in mind that this workaround is not ideal because placing the packages on hold will prevent security updates for the packages on hold.
Because of this, the following workaround is not recommended. You can apply the workaround below but keep in mind that the workaround will possibly expose you to lack of security updates for the packages on hold.
According to this thread, you can run the following commands as a workaround to hold the packages and prevent updates.
sudo apt-mark hold libmutter-10-0
sudo apt-mark hold libmutter-10-dev
sudo apt-mark hold mutter-common
After you hold the packages, reinstall mutter-rounded and then it should work again.
Lastly, you can run the following commands if you need to revert the changes made by the workaround (allow future updates of these packages).
sudo apt-mark unhold gir1.2-mutter-10
sudo apt-mark unhold libmutter-10-0
sudo apt-mark unhold libmutter-10-dev
sudo apt-mark unhold mutter-common
