See here: https://codesandbox.io/s/pagedjs-first-page-in-a-named-group-bug-3yvzf

An unnecessary page break is created before the first page, creating an empty first page. It can be fixed in 3 ways: remove the wrapping div.book, remove the page class from the first div.page, or remove the whole named page group definition from the css file.

Expected behavior: should be able to put any page in any named group