Heading bar is missing in the APK

Dear all,
I don't know if it is a bug, but I declared a device default theme that I can see when using the Companion. There, I can see the heading bar

When I compile the aia into APK the heading bar disappears

This is happening in other apps that I am developing. Any clue?

It is a bug.

Either build your own title bar or use an extension that generates an action bar

ok.Thank you