I just found out that setting Hardware-Acclerated to false will disable Elevation.
I also read a thread about an user reporting that issue but the problem could not be solved. It is probably because of the hardware accleration
Sadly the H-A causes crashes on my app, so i had to disable it.
I wasn't able to reproduce the crashes on myself but on google play it is my most common crash (signal 11)
I read on the forum that others fixed it by disabling hardware-acceleration.
As I wrote, the elevation feature is a native feature. If it is disabled when hardware acceleration is disabled then it is not a bug in B4A. This is how Android is designed (though I don't remember seeing it documented anywhere).