Something wrong when eager loading descendants

[CreationLee]

I am using like $comments = Comment::whereIsRoot()->with('descendants')->paginate(); but wrong result returned, such as ,somecomment has one descendants, but it returned nothing, some comment get 4 descendants but it only returned 2 or less. When i'm using `$comments = Comment::whereIsRoot()->get();

foreach($comments as $comment) { $descendants = $comment->descendants; } ` The result is correct