Assertion in attempt to register a namespaced meta type

In Qt add-ons, it is quite common to have declarations like

QT_BEGIN_NAMESPACE
Q_DECLARE_TYPEINFO(QT_PREPEND_NAMESPACE_A(AClass), Q_MOVABLE_TYPE);
QT_END_NAMESPACE

Q_DECLARE_METATYPE(QT_PREPEND_NAMESPACE_A(AClass))

After some recent refactoring, an attempt to

qRegisterMetaType<QT_PREPEND_NAMESPACE_A(AClass)>();
qRegisterMetaType<QList<QT_PREPEND_NAMESPACE_A(AClass)> >();

causes an assertion in qmetatype.h
> ASSERT failure in qRegisterNormalizedMetaType: "qRegisterNormalizedMetaType was called with a not normalized type name, please call qRegisterMetaType instead.", file ..\include/QtCore/../../../qtbase/src/corelib/kernel/qmetatype.h, line 1579

Debuggings shows two related issues:
1) in Q_DECLARE_METATYPE(QT_PREPEND_NAMESPACE_A(AClass)), QT_PREPEND_NAMESPACE_A macro doesn't expand and the metatype name become "QT_PREPEND_NAMESPACE_A(AClass"
2) due to missing right paren in 1), the normalized meta type name for "Container<QT_PREPEND_NAMESPACE_A(AClass)>" is "Container<", which indeed causes an assertion in qRegisterNormalizedMetaType()

The debug output for the attached example is:

QMetaObject::normalizedType:
< QT_PREPEND_NAMESPACE_A(AClass)
> QT_PREPEND_NAMESPACE_A(AClass)
> QT_PREPEND_NAMESPACE_A(AClass
QMetaObject::normalizedType:
< QT_PREPEND_NAMESPACE_A(AClass
> QT_PREPEND_NAMESPACE_A(AClass
> QT_PREPEND_NAMESPACE_A(AClass
QMetaObject::normalizedType:
< QList<QT_PREPEND_NAMESPACE_A(AClass>
> QList<QT_PREPEND_NAMESPACE_A(AClass>
> QList<
ASSERT failure in qRegisterNormalizedMetaType: "qRegisterNormalizedMetaType was called with a not normalized type name, please call qRegisterMetaType instead.",
file ..\include/QtCore/../../../qtbase/src/corelib/kernel/qmetatype.h, line 1579