There is a user Sara Chipps (Engineering Manager at Stack Overflow), who is Moderator in Meta Stack Overflow but not the moderator on the main Stack Overflow site.
Also viewing her network profile (other than Stack Overflow), on all the sites I can see her main site profile only. From the main site profile, there is no link to meta site, also the meta site account does not exist.
This is very new to me. Is this is a bug or expected behaviour?