I'm using a shortcode from the MB User Profile extension to allow users to edit their user custom fields from the frontend. I'm using the Astra Theme, the site is built with Beaver Builder/Themer, and I'm on WordPress 5.5.3 / PHP 7.4.
When trying to submit the frontend form, the page refreshes, but no success message appears and the fields are not updated. I turned on WP Debug, but I didn't notice any errors.
I've tested the shortcode mb_user_profile_info again on my local site but not see any issue. Please deactivate all other plugins, leave Meta Box, Meta Box, and switch to the default theme of WordPress (Twenty TwentyOne) then check the issue again.