You can use the 'gsettings' command to clear that:
gsettings set org.gnome.shell enabled-extensions "[]"
And don't be concerned about the default extensions not showing up there. They are not meant to. Default (system) extensions are considered implied. If you want to see everything more clearly then use:
gnome-shell-extension-prefs
That all said, extensions don't sound like the problem with this bug...
You can use the 'gsettings' command to clear that:
gsettings set org.gnome.shell enabled-extensions "[]"
And don't be concerned about the default extensions not showing up there. They are not meant to. Default (system) extensions are considered implied. If you want to see everything more clearly then use:
gnome- shell-extension -prefs
That all said, extensions don't sound like the problem with this bug...