backend bug after last update

Hi,

after the last update the Backend is buggy. I only see the left navigation and the top menü. But the pages itself are nearly empty. Please see screenshot.
I deactivated all plugins, but the bug stays the same. I switched to Hello theme, now it’s working, but that is not the best solution.

Also there is a weird update message for Elementor – although all plugins are up to date. The message is gone when “Hello” is activated.

The page I need help with: [log in to see the link]