carry over the seq_ack when resuming

discord/gateway.py

@@ -883,6 +883,7 @@ class DiscordVoiceWebSocket:
         *,
         resume: bool = False,
         hook: Optional[Callable[..., Coroutine[Any, Any, Any]]] = None,
+        seq_ack: int = -1,
     ) -> Self:
         """Creates a voice websocket for the :class:`VoiceClient`."""
         gateway = f'wss://{state.endpoint}/?v=8'
@@ -891,6 +892,7 @@ class DiscordVoiceWebSocket:
         socket = await http.ws_connect(gateway, compress=15)
         ws = cls(socket, loop=client.loop, hook=hook)
         ws.gateway = gateway
+        ws.seq_ack = seq_ack
         ws._connection = state
         ws._max_heartbeat_timeout = 60.0
         ws.thread_id = threading.get_ident()

discord/voice_state.py

@@ -574,7 +574,10 @@ class VoiceConnectionState:
         self._disconnected.clear()
 
     async def _connect_websocket(self, resume: bool) -> DiscordVoiceWebSocket:
-        ws = await DiscordVoiceWebSocket.from_connection_state(self, resume=resume, hook=self.hook)
+        seq_ack = -1
+        if self.ws is not MISSING:
+            seq_ack = self.ws.seq_ack
+        ws = await DiscordVoiceWebSocket.from_connection_state(self, resume=resume, hook=self.hook, seq_ack=seq_ack)
         self.state = ConnectionFlowState.websocket_connected
         return ws