Bottom bar becomes visible in SwiftUI

I'm developing a SwiftUI app which users first see a sidebar (Screen A) with multiple tappable options. This view also have a IOS 14 toolbar with bottom placement. Both of the screens use the same application state - singleton data source.

.toolbar(content: {
     ToolbarItem(placement: .bottomBar) {
           Text("Settings")
           .onTapGesture {
                //...
           }
     })

When user has clicked an option in the Screen A, it navigates user to a second screen (Screen B) by using standard navigation link.

Then, whenever app presents a sheet in Screen B, an empty bottom bar becomes visible in the bottom of the second screen if user updates the data source in this sheet.

It seems that Screen A is also updated when user opened a sheet in Screen B and changed the data source and somehow toolbar area in Screen A is affecting Screen B.

Here is the example code as gist.

Any idea about how to avoid this case?