SOLVED - Can not copy images and other media in Course Presentation

SOLVED
The bug was not in H5P, but in Imunify360 - some security-software on my web-hosts servers.
Imunify has now corrected the error and pushed updates to my webhost.
If others experience the same issue – try asking to Imunify360..

(Is there an "official" way of marking the bug report as solved?
I think the issue is relevant if someone encounters this issue, so deleting the post will not be good ... - or what?)

ORIGINAL POST:

In Course Presentation (CP) I get a 403-error when I click “Update” after I have copied elements in the presentation.

The error comes if I copy images and audio, but not if I copy texts, tasks or links.

I also get the error if I create a new CP and paste in a copied CP. Then it will not let me Create the new CP when clicking the “Create”-button. (That is if the copied CP has Images og Audio - if the copied CP only has text I do not get the error).

Platform: Wordpress 6.4.3 (PHP version 7.4.33)

Desktop: macOS Ventura v. 13.6

Browsers: Chrome, Firefox, Safari

H5P Plugin version 1.15.7 (and H5P Mods)

Content type: Course Presentation 1.25.9 (and 1.25.7)

Browser console errors (Chrome):

 /wp-admin/admin.php?page=h5p_new&id=229:1 

 POST https://danskfordig.dk/wp-admin/admin.php?page=h5p_new&id=229 403 (Forbidden)

 admin.php:8 Error handling response: TypeError: Cannot read properties of undefined (reading 'parentNode')

    at o (chrome-extension://lonpjbllihccdolpahofjieaklpckdmc/js/content.js:2:22238)

    at chrome-extension://lonpjbllihccdolpahofjieaklpckdmc/js/content.js:2:61440

    at chrome-extension://lonpjbllihccdolpahofjieaklpckdmc/js/content.js:2:61249

The error showing up is:

403

Forbidden

Access to this resource on the server is denied!

Recent changes: I have updated the Content type library a few days ago, but did not experience this when working yesterday.

Content types: