Course Presentation

I have various H5P activities on my website, and generally love creating them. However recently one of the Course Presntations stopped working. When viewing the page on the website it appears to be blank. On trying to edit the H5P content, when I click update I get the error message "unabletocopy". If I try to create new material I get the same error. Any help greatly appreciated, especially as a big conference is wanting to access this material on Monday! 

Course Presentation - not working activity menu.

Interactive Book - not working activity menu.

Platform and version number. Moodle 3.6 after upgrade to Moodle 3.10 the problem is the same.

Mobile and Desktop

Browser: all

H5P plugin version 1.22.2

H5P content type and version: Course Presentation, Interactive Book

Any browser console errors:

Uncaught TypeError: Cannot read property 'prototype' of undefined

    at h5p-editor-range-list.js?ver=1.0.11:474

    at h5p-editor-range-list.js?ver=1.0.11:478

I've recently got a lot of problems after updating the h5p plugin and their libraries. I am using H5P 1.15.3 running on Wordpress 5.7.2

One of them is: the Course Presentation Editor doesn't work at all.  I am getting this code [field:group:coursepresentation:presentation] instead of editable presentation. The browser console  (Chrome, Firefox) shows me a bunch of error messages like " Uncaught TypeError: Cannot read property 'prototype' of undefined..."

I would try to reinstall the plugin. how can I prevent losing the created content?