The included Parsedown package for rendering MarkDown is quite old and no longer well maintained, so it was replaced by CommonMark.
You can see all changes since version 1.10.4 here.
phpwcms v1.10+ brings compatibility with PHP 8.2+ and adds features regarding compatibility to the most current MySQL/MariaDB.
Remember to upgrade phpwcms installations < v1.10 with the legacy version v1.9.41 first.