Hi there,
This did change in the most recent version. For security reasons, we’re preventing any potentially dangerous code from being added into the post_meta table in the database.
Previously, anything and everything was allowed in the Page Header. Now, it only accepts the same code that the actual WP editor accepts, which is all HTML except for scripts and styles.
Instead of adding your <style>
tags in the Page Header, I suggest using a plugin like Simple CSS.
Let me know if you need more info 🙂