Same here on Android (Galaxy phone, everything up to date), and this started a few days ago. Works fine on iPad and Windows desktop.
Precisely what happens is: if I select a book on my bookshelf without filtering, the book doesn't open. If I filter my books as indexed, then the book page opens, but no recipes are listed, blank space.
If I search for a recipe directly at recipes level, then I can access the recipe from the same book which would not open with book search. I hope this is clear!