SwiftUI slider in accessibilityRepresentation & XCUITest slider's normalizedSliderPosition

Hi everybody,

given the following case using SwiftUI:

Button("testButton", action: noop)
.accessibilityRepresentation{representation: {
    Slider(value: $sliderData.sliderValue)
})
.accessibilityIdentifier("testSlider")

I'm trying to control the slider using XCUITest via slider.adjust(toNormalizedSliderPosition: 0.2)

and receive the following error message:

Failed: Unable to get expected attributes for slider, found {
    "XC_kAXXCAttributeMaxScrubberPosition" =     {
        X = 0;
        Y = 0;
    };
    "XC_kAXXCAttributeMinScrubberPosition" =     {
        X = 0;
        Y = 0;
    };

Similarly, print (slider.normalizedSliderPosition) leads to the error message "Failed to determine current position of slider "0 %".

Is there a way to set and read the value of accessibilityRepresentation-Sliders with XCUITest?

Thanks!