I am using Moodle 3.10.3 and have noticed an issue with the H5P documentation tool when it is used in an interactive book. It appears that if we have more than one documentation tool in an interactive book, the submit button does not work on the first of the documentation tools.
Step the reproduce the bug,
1, Add activity, choose H5P core of Moodle.
2, Add an Interactive book
3, In the interactive book, add some pages with more than two documentation tool content.