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I am seeing the behavior described in the title with a signal that has been created as:

        signals[FINISHED_EVENT] = g_signal_new(
                "finished-event",
                G_TYPE_FROM_CLASS(klass),
                G_SIGNAL_RUN_LAST,
                0, // no default handler
                NULL,
                NULL,
                xmi_VOID__BOOLEAN_STRING,
                G_TYPE_NONE,
                2,
                G_TYPE_BOOLEAN, // gboolean -> result
                G_TYPE_STRING // gchar* -> buffer
        );

Now when I emit this signal (from C, not Python), the signal callback in Python always receives False, regardless of what was provided to g_signal_emit...

    def _test_succeed_finished_cb(self, job, result, buffer):
        self.main_loop.quit()
        self.assertTrue(result)
        print("message: {}".format(buffer))

The buffer string is passed through without problems. I have tried this on both macOS (3.30.2) and Linux (3.22.0), and I get the same incorrect behaviour.