It seems like as of version 5.0.3 the drop down menu no longer works.
For example if you view a website from a mobile view, with a menu, and click on the hamburger menu, it doesn't do anything.
To test, I created a brand new website. Installed and enabled radix 5.0.3, and created a subtheme. Then created some menu entries in the Main Navigation menu. Assigned that block to the Navbar right section. Then tested the menu works on mobile. And it doesn't. Then I remove /web/themes/contrib/radix (5.0.3), and install 5.0.2, clear the website cache and the menu works again on mobile.
It appears something to do with changes in 5.0.3. Here: https://git.drupalcode.org/project/radix/-/commit/ee9c0e44a4fa01c19776ad... and here: https://git.drupalcode.org/project/radix/-/commit/e22a50225ec13571eb2462...
Fixed
5.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.