React Navigation transparent bar missing title and buttons on android - android

I'm building a React Native app with React Navigation 2.5.x. I have a transparent navigation bar. On iOS everything is fine, but on Android the title, back button and any barButton I put there is missing.
The navigation options is defined like this:
const navigationOptions = {
headerStyle: {
borderBottomWidth: 0,
},
headerTransparent: true,
headerTintColor: Colors.barTintColor,
};
If I try to inspect the view I get the header component when tapping, but on Android I get the scenes content view instead.
Previously I had the header style positioned absolutely and a transparent background color. I would like the bar to be transparent and visible above the rest of content screen. But positioning it absolutely, setting headerMode och headerTransparent all makes the headers disappear.
What am I doing wrong?

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