Scene3DView is not a type

dogbear

Before I start pulling my hair out, I thought I might try asking for help here.

On a Fedora 36 installation with a stock Qt5 installation, the following code for the main.qml works with no issues.

import QtQuick 2.12
import QtQuick.Layouts 1.15
import QtQuick.Window 2.12
import QtQuick.Scene3D 2.15

Window {
    id: mainWindow
    width: 840
    height: 840
    visible: true
    title: qsTr("My 3D World")
    color: "blue"

    Scene3D {
        id: mainScene
        anchors.fill: parent
        compositingMode: Scene3D.FBO
    }

    Scene3DView {
        id: viewport
        x: 5
        y: 5
        width: parent.width * 0.80
        height: parent.height * 0.80
        scene3D: mainScene

        MyScene {
            id: myscene
        }
    }
}

On Windoze 10 however, with versions Qt 6.2.4, 6.3.1, and 6.4 I get this runtime error:

QQmlApplicationEngine failed to load component
qrc:/main.qml:20:5: Scene3DView is not a type

Does Scene3DView no longer exist in Qt6? Has it been moved to a different module? Am I missing something stupidly simple?

Many thanks in advance.