Custom CSS on navbar broken

Using the plugin for years already and on devices smaller than 768px, I always used custom CSS to hide the menu background using: background: none!important; for the class (Sticky Class) I defined in the interface. This is just to just only show the hamburger menu on mobile while scrolling and not the menu bar as well.

After the update to version 2.3.3, this does not work anymore and I always see the background color / navigation bar, also if the screen is smaller than 768px. Demoted the version to 2.3.1 and there my custom CSS change is working again.

Don’t know what kind of CSS changes have been done on 2.3.3, but if this can be removed again or addressed differently that would be great.

Thanks