Pagebreak code is stripped out when editing text filter

I think the problem is that the plugin definition in pagebreak.ckeditor5.yml needs to specify which HTML elements it uses, so those HTML structures can be automatically added to the "Allowed HTML tags" list.

I tried updating the pagebreak.ckeditor5.yml file with this:

    elements:
      - '<div>'
      - '<div class="page-break" style="page-break-after:always;">'
      - '<span>'
      - '<span style="display:none;">'

However, when I hit "save" it then gave this error:

The current CKEditor 5 build requires the following elements and attributes:

So how do we modify the Pagebreak plugin so it works as expected?

Here are the ckedito5.yml line changes.

I am moving this to critical because the module does not work as expected via 3.x. and Drupal 10.

I am stumped on how to fix this. I suspect the <span> span tag will need an additional plugin.

The problem is the "style" attribute, that doesn't work well with ckeditor 5.

It's annoying that the "style" attribute is specifically noted by core to be unsafe, which is why it's filtered out by the "Limit allowed HTML tags and correct faulty HTML" filter, but this plugin uses it.

I opened an issue in the ckeditor issue queue, will see what the community says: https://github.com/ckeditor/ckeditor5/issues/15651

I wonder if this module should require the extended_html_filter module instead of core's HTML filter?

FWIW wrapping the 'style' item in ckeditor5.yml with quotes like this does not solve the problem:

    elements:
      - '<* style>'