@threadi
Thank you for your interest.
The issue is seen on multiple providers with Cloudlinux and its PHP Selector. All Gutenberg and Classic editor both had issue. I did not check with other Visual Builders but it should be affecting all other builders and editors. The issue was with the mysqli extension and changing mysqli extension to nd_mysqli fixed the issue.
Update from Hosting Provider
The issue is caused by the client library version fetched from the MariaDB driver does not meet the minimal version number hardcoded in ‘wp-admin/includes/class-wp-site-health.php’ code. Starting from MariaDB 10.6 the utf8 character set (and related collations) is now by default alias for utf8mb3. However, MariaDB 10.6 support is yet to be implemented on Cloudlinux system. Hope this helps. Do let us know if you have any other questions.
I have seen same issue with Maridb 10.3.38-MariaDB-cll-lve