Hi Everybody,
My system details: Moodle 3.10.1+ (Build: 20210226). H5P mod_h5pactivity: 2020110900
I can see attempt answers for all sub-questions in Interactive Video and Course Presentation H5P types/activities. See screenshot below:
attemp_details_subquestion_FOR_course_presentation.PNG 
But, I cannot see the details, individual attempt answers for each sub-questions (multiple choice, true/false, drag&drop,..) in INTERACTIVE BOOK. It only shows total score as below:
general_attemp_interactive_book.PNG 
My guess is that since the Interactive book is a new H5P type (when you compare with Interactive video and Course presentation), that my be the reason for the delay in implementation of the same detailed attempt answer view for sub-questions.
1. When do you plan to implement the same detailed attempt answers view for Interactive Book in Moodle?
2. If it takes too long, can you please guide me where in the code I can apply the change/patch for this future ?
Thanks!