I was trying to mine some bookshelfs with a Silk touch pickaxe, but the block didn't drop when destroyed, I log out and rejoin and it drop the item again, no change in config or nothing, it is the second time it happens, the first occur when trying to mine a gold ore.

Here is game footage: https://1drv.ms/v/s!AjoulclHATbMg7kXuVa0rU267U_G5Q
Youtube: https://www.youtube.com/watch?v=bd4jolSDzlk
The error ocour at: 0:58
sorry the file size was 69Mb.