I put a book with 10 pages written to it into an Item Frame, then attempted to change a single page in the book using /entitydata.

The Expected outcome was page 5 changing to say "hello".

What happened is all pages were erased and page 1 edited to say "hello"

Steps to recreate issue:
1: Place Written Book, with more than 1 page filled out, into an item frame.
2: Use command /entitydata @e[type=ItemFrame] {Item:{tag:

}}
NOTE X is the page number you wish to change