Problem/Motivation
If an asterisk is added to an allowed html tag in the filter_html configuration an error is thrown due to code added in #3228334: Refactor HTMLRestrictionsUtilities to a HtmlRestrictions value object
See https://www.drupal.org/project/drupal/issues/3228334#comment-14440797 for more information.
Steps to reproduce
Install standard profile
Go to /admin/config/content/formats/manage/basic_html and add * to the list of allowed attributes on one of the tags (e.g <img * src...>
Save the format
Try to edit the format again
Error thrown:
Error: Unsupported operand types in Drupal\filter\Plugin\Filter\FilterHtml->filterAttributes() (line 122 of core/modules/filter/src/Plugin/Filter/FilterHtml.php).