Entity is visible, even when not active

[ThePaSch]

Hi,
in my Custom Story, I have the player search for a book. Then, he has to bring it to a table to make the book in the player's hands disappear and to have an open book appear on the table ("Opening the book on the table").
For that, I have switched the open book to being inactive. However, even with a "void OnStart {}" script file (I tested it), it IS visible and collides from the beginning.
I have checked everything, and the book is neither active, nor have I forgotten to save or something.
This is probably a bug, but maybe I'm also just too stupid and missed something.
As I said, it's not possible for it to be a scripting error.