Unfortunately, I seem to regularly get stuck in the books, forcing me to restart the game. Possibly an issue with a low framerate causing clipping inside, since I am on a Chromebook running at roughly 15 frames per second. What method are you using to move the books? For moving platforms, I usually add a rigidbody to the object and a script using rb.moveTo() (I forgot the exact name of the command, I haven't programmed in Unity in a while). I would like to know your method to know how it may cause the clipping.