CF7 v 5.2 validation error messages disappear

Hi
Version 5.2 doesn’t show validation error messages for example the required fields. When submitting, the fields are highlighted red but with no error messages. Neither static or floating style works!
I have tried to deactivate every plugin on the website, but it still doesn’t work.

WordPress: 5.4.2
Theme: The7
Plugins:
– Advanced CF7 DB
– Akismet Anti-Spam
– Contact Form 7
– Post SMTP
– The7 Elements
– The7 LayerSlider WP
– The7 Ultimate Addons for WPBakery Page Builder
– The7 WPBakery Page Builder
– WordPress Version Info