I ported my app to Qt6 and I encountered this issue in Android.

When an image is captured, the preview property for ImageCapture is locked to one capture behind. 

Below are the content of preview property when I trigger capture():

• 1st trigger => empty (Image viewer will show black)
• 2nd trigger => image://camera/preview_0 (Image viewer will show the previous image)
• .. and so on

    CaptureSession {
        camera: id_camera
        imageCapture: id_imageCapture
        videoOutput: id_viewFinder
    }    

    Camera {
        id: id_camera
        active: true
    }    

    ImageCapture {
        id: id_imageCapture        
        onImageCaptured: function (requestId, previewImage) {
            console.log(preview)
        }        
    }

    Image {
        id: id_imagePreview
        source: id_imageCapture.preview
    }

    VideoOutput {
        id: id_viewFinder
        MouseArea {
            anchors.fill: parent
            onClicked: id_imageCapture.capture()
        }
    }