Menu bar turning black in full-screen mode - Ventura

Then have a few suggestions ;

1 - Get Support Choose a product and we’ll find you the best solution.Start now and open an Apple Support Ticket as they are Apple Employees to deal will these types of issues . 

2 - Product Feedback - Apple and make it known to Apple regarding this ongoing issue 

Rolling Stones : " You can always get what you what, but you can get what you need "

Sorry but when in Full Screen Mode the Main Menu Bar is normally on visible

First image is Full Screen Mode using the System Setting >> Appearance >> Light Mode

Second images Normal (Non Full Screen Mode )with Light Mode

The User appears to be using either Dark Mode OR using Auto Mode to auto Change from Daylight Hours ( SUN UP ) and now in you location SUN SET.

That is how the system works at present. I am not aware of any existing user settings to change it.

As P. Phillips said, use the Apple feedback page to let Apple know your views, as only Apple can change how macOS works.

Self Correction and should read " Sorry but when in Full Screen Mode the Main Menu Bar is normally NOT visible "