upgrade wp killed galleries and submenu

My provider Web-oké upgraded wp from 5.8.3 to 5.9
My site https://www.zanggroep-eige-wies-roggel.nl did not work properly anymore
1. My galleries stopped working
2. My hamburger ( phone) menu button did not unfold anymore
3. My submenu items ( under media menu item) did not work anymore

The site is build with Elementor Pro and was fine till jan 26

I restored the site from a Wp migrate Back-up but the errors remained
Finally a downgrade of WordPress to 5.8.3 made it all work again
I hope I don’t have to rebuild the site from scratch after another WP upgrade…

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