navigationBarStyle: backgroundColor not correct when the app is in the background on Android

[Jun711]

Version

Tell us which versions you are using:

• react-native-router-flux v4.?.? (v3 is not supported)
• react-native v0.?.?
  using "react-native-router-flux": "^4.0.0-beta.27"

Expected behaviour

expect the navbar when the app is in the background to have the color as when the app is running.

Actual behaviour

navbar is grey color while the app is in the background mode. This happens when I press the home button and android phone shows a list of apps running in the background. navbar color is not correct but the app icon does show up.

Steps to reproduce

For non-obvious bugs, please fork this component, modify Example project to reproduce your issue and include link here.

1. Note the navbar color
2. Press home button
3. Android device will show a list of apps running in the background
4. Note the navbar color of the app is different from the color when the app is running
   Maybe I missed out some props?

<Scene
        navigationBarStyle={{backgroundColor: 'red'}}
        key='home'
        component={HomeContainer}
        title='Home'
/>

[aksonov]

Please try to reproduce it with Example project and latest version 4.0.0-beta.40. Feel free to open if the issue still exists