I had the same problem and looked it up online.

Hit the enter button on your keyboard (or whatever button you have to open the notebook). That should bring up a hint box and a button with Lily's face on it should appear in the corner of the screen that was previously invisible for some reason.

It worked for me. Hope it works for you guys too.

PurplePanda1342 has the right idea. But sometimes you need to press the button multiple times. Usually works with any cutscene that's stuck.

Thanks for all the response, also a special thanks to PurplePanda1342, it worked!, check his post and it will most likely work for you! Thanks.