How to hide NSToolbar background when NSHostingController's ScrollView is at the top

In Monterey, when a user was at the top of a ScrollView implemented inside of a NSHostingController's view (that was itself embedded in a window with a NSToolbar), the window's toolbar background would be hidden until the user scrolled from the top.

In Ventura, this behavior is different, with the toolbar's background visible all of the time unless a traditional NSScrollView is used (which means no SwiftUI).

Is there the ability to change this behavior within SwiftUI some how now?