[Reg 6.2 -> 6.5] QtQuick.Templates causes crashes if QtQuick types are not registered

import QtQuick.Templates 2.15 as T
T.Control {}

ASSERT: "accessibleAttached" in file /home/qt/qt6dev-src/qtdeclarative/src/quicktemplates/qquickcontrol.cpp, line 2163

void QQuickControl::accessibilityActiveChanged(bool active)
{
    Q_D(QQuickControl);
    if (!active)
        return;

    QQuickAccessibleAttached *accessibleAttached = qobject_cast<QQuickAccessibleAttached *>(qmlAttachedPropertiesObject<QQuickAccessibleAttached>(this, true));
    Q_ASSERT(accessibleAttached);
    accessibleAttached->setRole(d->effectiveAccessibleRole());
}