A slight extension of another recent behemoth of a thread, this one’s short though.
If you open up the collection book on the pause menu, then press escape, the pause menu “pretends” to close. It appears like the pause menu has disappeared from behind the collection book. Though pressing escape again closes the collection book, and the pause menu returns.
Essentially it just means there’s a buggy extra press of the escape button you need to close the collection book when accessing it this way.