There is no longer a Writable Book (Book and Quill) in the game, either in Creative Inventory or whit commands.
We can give ourselves a "writable_book" with an command but we receive a completely normal book.
The book and quill that I had in my inventory have been transformed into a simple book since 1.16.100.56 but the writable books have not been added in this version
Thank you for your report!
We're actually already tracking this issue at MCPE-100361, so I will resolve and link this ticket as a duplicate.
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