QApplication refuses exception handling on macOS arm64

My program realizes exception handling in application events by catching exceptions in a derived notify(QObject*, QEvent*) method.

It works well on Windows, Linux and macOS x86_64. However, on macOS arm64 try-catch does no longer catch any exception. Instead, the program crashes. I created a test scenario to prove it:

struct Receiver : public QObject{
    bool event(QEvent* e) {
        if(e->type()==QEvent::User+1)
            QException().raise();
        return QObject::event(e);
    }
};

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QEvent e(QEvent::Type(QEvent::User+1));
    Receiver obj;
    try{
        obj.event(&e);
    }catch(const QException& exn){
        qWarning("(1) catching %s", exn.what());
    }catch(...){
        qWarning("(1) catching unknown exception");
    }
    try{
        QCoreApplication::sendEvent(&obj, &e);
    }catch(const QException& exn){
        qWarning("(2) catching %s", exn.what());
    }catch(...){
        qWarning("(2) catching unknown exception");
    }
    return 0;
}

On any platform, this example will print as expected:

(1) catching std::exception
(2) catching std::exception

However, on macOS running on arm64 this example will crash:

(1) catching std::exception
libc++abi.dylib: terminating with uncaught exception of type QException: std::exception

Interestingly, the example will even succeed on macOS/arm64 when using QGuiApplication or QCoreApplication instead of QApplication.

The exception seems to be not propagated to try-catch but instead causing a termination.

The main difference between the working QGui/CoreApplication event handler and the crashing QApplication event handler is QApplicationPrivate::notify_helper where the problem seems to lie.

I also tried to use NSException as well as objective C try-catch without success.