Book at multilingual site

I have put the question at book core page, but I have no answer, maybe you can help me...

http://drupal.org/documentation/modules/book#comment-5972670

1. Create a book in language1
2. Create a page to be a child page.
3. At the book outline there is no book.
4. Change the language of the book to language neutral.
5. Now there is a book at the book outline.

The same happens if I add a page to an already childpage that is in language1.

Any help to solve this?

Thanks in advance.