Config override for multi-site

Hi,

I have a multi-site set up with /sites/default and /sites/dev.
In the sites.php I have set /sites/default for my-domain.tld and /sites/dev for dev.my-domain.tld. This is working, I have two website running a different database on different sub domain.

The problem is I want to override the site name with this : $config['system.site']['name'] = 'New site name';

This works when I add the line $config['system.site']['name'] = 'New site name'; in /sites/default/settings.php for the my-domain.tld.

But it doesn't work when I add the line $config['system.site']['name'] = 'New site name'; in /sites/dev/settings.php for the dev.my-domain.tld

Thanks in advance for your help.