Exceptions not propagating for ARM Macs

Our app has many sanity checks which give a message then throw a C++ exception on failure.  The exception is caught in the event loop: code below. It allows users to continue working or at worst save changes then exit on their own.

Code works in Qt 5 for Intel Macs or Windows, and in Qt 6 for Windows. Exception does not reach QApplication::notify on ARM Macs, but terminates immediately.  This makes a worse user experience.

In general, users should have control over exception handling on all platforms.  Exception throw should mean "get me out of here", not "die suddenly"

Note that signals/slots do not pass exceptions on any platforms.  The reported problem happens with ALL exception throws, even if no signal/slot.

bool Our_Application::notify(QObject* receiver, QEvent* event)
{
    bool done = true;

    try
   

{         done = QApplication::notify(receiver, event);     }

    catch (fatal_exception &fatal)
   

{         throw;                // abort.  Good place for a breakpoint     }

    catch (our_exception &other)
   

{         QApplication::beep();    // beep and continue.  Usually follows a nil test with error message     }

    catch (...)                // unknown error.  Try to continue.  Problem may not even be serious
   

{         QApplication::beep();     }

    return done;
}