Remco,
I am having the same problem with my WordPress. I have a multisite installation. The wierd thing is that if I log in with the Superadmin account and go to edit a page, I don’t get the error: “Failed to load plugin: wpeditimage from url https://www.mywebsite.com/wp-includes/js/tinymce/plugins/wpeditimage/plugin.min.js”.
However if I log in with another user (with administrator privileges), then I get the error.
Did you solve your problem?
Any clue anyone?