The SystemBars extension is still in an experimental stage. The Status bar and Navbar can no longer be colored independently of each other since the targetSdkVersion=35 update. My extension uses a workaround/trick to prevent the Navbar from being colored. To do this, the Navbar must be temporarily hidden for a few milliseconds to prevent coloring. However, this requires that the Title bar is hidden (in the Designer). If desired, this should then be created manually via a HA and colored accordingly (if desired).
Post your AIA or send it to me via PM. I’ll test it with your app and report back…