Saving group page's layout results in error

I seem to get rid of the error message, but this MR seems to ignore settings.php versions when choosing where to redirect.

For instance in settings.dev.php I cav have
$settings['group_domain_mapping']['example.ddev.site'] = 'example.com';
That works for most part of Group Domain, but with this change instead of getting an error message the user is redirected to the production domain instead of the local. I guess this might work at production, but not with other environments.

This looks like it's related to another issue and maybe this after getting it to check the domain mapping could work as a solution for both.