OK,

So when I tried to give myself a written book with JSON Data, it now says "*Invalid book tag*". The command I typed in works with ANY Other snapshot that supports JSON Books, but not this snapshot.
Here is the command I typed in:

/give @p written_book 1 0 {pages:["

"]}

Can you please help me? If a feature was changed, and now this isn't supported please comment. Also, if I just did anything wrong, comment. Thank you!