Stopping the xwiki:actions:* events doesn't stop the submit event that triggered them

Open a page in edit mode then open the JavaScript console and enter this:

require(['jquery', 'xwiki-events-bridge'], function($) {
  $(document).on('xwiki:actions:beforeSave', function(event) {
    event.preventDefault()
  });
});

Save the page. The submit is not prevented.

The workaround is to stop the original event with:

require(['jquery', 'xwiki-events-bridge'], function($) {
  $(document).on('xwiki:actions:beforeSave', function(event, data) {
    data.originalEvent.stop();
  });
});

but this has 2 problems:

• you need to be aware that the original event exists
• you need to use old Prototype.js code to stop the event (because the xwiki:actions:* events are triggered from Prototype.js)