Qt3D crash when using ids in the component list

ccolin

The following QML document, when loaded by a simple C++ program using QQmlApplicationEngine, crashes.

import QtQuick
import QtQuick.Scene3D
import Qt3D.Core
import Qt3D.Render
import Qt3D.Extras

Window {
    width: 640
    height: 480
    title: "hello, world!"
    visible: true
    Scene3D {
        anchors.fill: parent
        Entity {
            RenderSettings {
                id: renderSettings
                Viewport {
                    normalizedRect: Qt.rect(0, 0, 1, 1)
                    RenderSurfaceSelector {
                        ClearBuffers {
                            buffers: ClearBuffers.ColorDepthBuffer
                            clearColor: Qt.rgba(1, 0, 1, 1)
                            CameraSelector {
                                camera: Camera {}
                            }
                        }
                    }
                }
            }
            components: [renderSettings]
        }
    }
}

The crash does not occur when running in a debugger. Running with an address sanitizer shows an access violation triggered by a call to QJSValuePrivate::encode(struct QV4::Value const &).

If I place the RenderSettings declaration in the components array directly instead of using an id it works fine. Is this a Qt bug, or is there something I’m misunderstanding?

On a slightly related note, why is it not possible to use a mix of both ids and inline declarations in the array (trying the components: [ Component {}, componentId ] syntax gives an error)?

Edit: this is using Qt 6.4 on Windows, with either GCC MinGW or MSVC