I've been playing a lot with Book & Quill since it came to Minecraft in Better Together.
But there's something that really makes me angry, when I open it, I break the block I was pointing (only blocks that break instantly).
But I noticed something: the first time you open it, works properly. After that, everytime you open the book it breaks the block.
I'm sure it only happens in touch devices.
It shouldn't be that hard to fix, snowballs, ender pearls and potions don't break the block...
I use a Samsung Galaxy J5 2016
(I'm trying my best to spell correctly)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-29752.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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