Appium: Camera issue on Nexus 5 and Pixel Phone

Question

My code (to test the camera functionality in the app)

((AndroidDriver) driver).pressKeyCode(27);

or

((AndroidDriver) driver).pressKeyCode(AndroidKeyCode.KEYCODE_CAMERA);

doesn't work to take a picture in the app. ( I only have it on the Nexus 5 and Pixel Phone)

When I try cmd adb shell input keyevent 27 in the app, also no reaction. When I try the same cmd in the camera app, it does take a picture.

I do have the same when i try the cmd when i am in Facebook app and try to take a picture.

Has someone seen this behavior before?