[Mailman-Developers] Rest API not returning members in alphabetical order

Based on Rest API documentation I expected that list of members will be returned in alphabetical order.

However, when I tried localhost:8001/3.0/lists/new.list.example.com/roster/member and localhost:8001/3.0/members/find?list_id=new.list.example.com&role=member&page=9&count=10 I got list of members in order of creation.

I tried same thing on another server, and I got members ordered alphabetically.

Any ideas what might be causing this behavior?