When placing a chiseled bookshelf in the world, the textures do not map correctly when RTX is enabled. In this example, the following texture pack was used Vanilla RTX (https://minecraftrtx.net/ - Version 1.21.20). 

Video - https://drive.google.com/file/d/1ldrFQ-Eosl9giSXlcfcP-uii652fj8Zi/view?usp=drive_link

Steps to reproduce

1. Download Vanilla RTX V1.21.20 and install by double-clicking it.
2. Make sure you're running Minecraft V1.20.81.
3. Make sure Ray Tracing is turned off under Settings > Video > Ray Tracing (pure vanilla minecraft with no additional texture packs)
4. In a Minecraft world create x4 chiseled bookshelves. Place them so that the front of the bookshelf displays in different directions.
5. Log out of the world and apply the Vanilla RTX pack
   1. Click on Settings > Global Resources > My Packs > Vanilla RTX Normals
   2. Click on 'Activate'
   3. You should only have 'Vanilla RTX Normals' and 'Minecraft Texture Pack' enabled
   4. This should automatically enable Ray Tracing (Settings > Video > Ray Tracing)
6. Log back into the world where the chiseled bookshelves have been placed. They will no longer render correctly with RTX enabled. If you try to interact with the block with a book, it will not display correctly either.

Possibly related bug MCPE-166159