Config override is not working

The configuration override is not working as expected when we try to extend the settings.

Steps to Replicate:

Step 1:
Install `config_override` module and enable it.

Step 2 :
In our custom module copy the `webform.settings.yml` file from `webform` and place it under `config\override` and update the changes required.

Step 3 :
Login in as admin and see the updated settings was visible there through ui ["admin/structure/webform/config "]

The found this occurs when i try to extend `third_party_settings` settings. When i looked into it it seems like in `WebformThirdPartySettingsManager.php` line no 9 it should be $this->config = $this->configFactory->get('webform.settings') rather than $this->config = $this->configFactory->getEditable('webform.settings')