interactive book

I'm trying to edit several interactive book activities.

Some I can edit (the smaller ones) some I can't edit (the bigger ones).
The one I have a problem with is 613.322 KB 

Is there a maximum size to edit Interactive books?
I'm using the H5P core plugin of Moodle 3.11.10 (build: 20220912) on a server with PHP 7.4.3

KInd regards

Frans Zwijnenberg

I created an interactive book for my students on Moodle. The students did the activities on it and can view their summary. On my end, I cannot see any attempts made. It is still displaying 0 submitted. What did I do wrong?

When creating an interactive book (issue was also reprocued with a True/False Question, Multiple Choice Question and Quiz), a long block of text is added to every textbox once the activity is saved. This includes text boxes, True/False questions, and the activity description page. When returning to the edit page the text can be deleted, but reappears upon saving the activity. This happened whether the text was typed directly into H5P or was copy-pasted from an external editor. 

Issue was reproduced using Google Chrome and Firefox.