fix(shard): handle RECONNECT opcode during initial connection flow

changelog/1155.bugfix.rst

@@ -0,0 +1 @@
+Handle unexpected ``RECONNECT`` opcode where ``HELLO`` is expected during initial shard connection.

disnake/shard.py

@@ -190,6 +190,16 @@ async def reidentify(self, exc: ReconnectWebSocket) -> None:
                 gateway=self.ws.resume_gateway if exc.resume else None,
             )
             self.ws = await asyncio.wait_for(coro, timeout=60.0)
+        # n.b. this is the same error handling as for the actual worker, but for the initial connect steps
+        except ReconnectWebSocket as e:
+            _log.debug(
+                "Unexpectedly received request to %s shard ID %s while attempting to %s",
+                e.op,
+                self.id,
+                exc.op,
+            )
+            etype = EventType.resume if e.resume else EventType.identify
+            self._queue_put(EventItem(etype, self, e))
         except self._handled_exceptions as e:
             await self._handle_disconnect(e)
         except asyncio.CancelledError:
@@ -204,6 +214,14 @@ async def reconnect(self) -> None:
         try:
             coro = DiscordWebSocket.from_client(self._client, shard_id=self.id)
             self.ws = await asyncio.wait_for(coro, timeout=60.0)
+        except ReconnectWebSocket as e:
+            _log.debug(
+                "Unexpectedly received request to %s shard ID %s while attempting to reconnect",
+                e.op,
+                self.id,
+            )
+            etype = EventType.resume if e.resume else EventType.identify
+            self._queue_put(EventItem(etype, self, e))
         except self._handled_exceptions as e:
             await self._handle_disconnect(e)
         except asyncio.CancelledError: