When middle clicking the chiseled bookshelf block with stored books in it, it saves it as an item with NBT (as I expected), but when I placed this block, there was no books visible inside the block (I think as the texture), and clicking the block doesn't give back the books, but when I break the block, all the books spawn as items (as normal).
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Does MC-48453 describe your issue?

Partially, because it's not only the texture, it's also not giving back the books when right clicking the chiseled bookshelf block as mentioned