get_site_option / update_site_option - the main site and sub sites do not share the same storage
get_site_option / update_site_option is supposed to get / update an option for the current network (contrary to its name).
I have noticed that it works only for sub-sites, all sub-sites share the same settings storage, however, the main site does not (the initial site that is not a subdomain or subdir). Why is that?