Read permission error after MQTT Moquette Broker restarts with active client connection (Windows)

Our client's on_connection_resumed method initiates a new connection if no session is present. This works fine with IoT Core when the client loses connectivity.

However, when paired w/ Greengrass, we get the following error in greengrass.log on the FIRST reconnect attempt:

2022-08-19T21:14:24.480Z [WARN] (Session Executor 0) io.moquette.broker.Authorizator: Client does not have read permissions on the topic username: -----BEGIN CERTIFICATE-----
XXXXX
-----END CERTIFICATE-----
, messageId: 3, topic: /topic/path. {}

Here is the client code:

def on_connection_resumed(self, connection, return_code, session_present, **kwargs):
    if return_code == mqtt.ConnectReturnCode.ACCEPTED and not session_present:
        self.reconnect()

Reconnect is essentially calling a disconnect (OK if this fails) followed by a fresh connect:

try:
    disconnect_future = self._shadow_client.mqtt_connection.disconnect()
    disconnect_future.result(timeout=FUTURE_TIMEOUT)
except:
    ....
try:
    mqtt_connection = mqtt_connection_builder.mtls_from_path(...)
    connected_future = mqtt_connection.connect()
except:
    ....

The error above is only present after the first reconnect attempt. Subsequent reconnect attempts connect successfully.

Auth component is configured correctly (fully permissive policy)