Use the longest reset_at value on shared 429

discord/http.py

@@ -392,14 +392,15 @@ class Ratelimit:
         self.reset_at = 0.0
 
     def update(self, response: aiohttp.ClientResponse, data: Union[Dict[str, Any], str]) -> bool:
-        # Shared scope 429 has longer "reset_at", determined using the retry-after field
         limit = int(response.headers['X-Ratelimit-Limit'])
+        reset_at = self.http.loop.time() + (float(response.headers['X-Ratelimit-Reset']) - time.time())
+        
+        # Shared scope (which only appears on 429s) could have a longer "reset_at".
         if response.headers.get('X-RateLimit-Scope') == 'shared':
-            reset_at = self.http.loop.time() + data['retry_after']  # type: ignore
+            reset_at = max(reset_at, self.http.loop.time() + data['retry_after'])  # type: ignore
             remaining = 0
         else:
             # Consider a lower remaining value because updates can be out of order, so self.outgoing is used
-            reset_at = self.http.loop.time() + (float(response.headers['X-Ratelimit-Reset']) - time.time())
             remaining = min(int(response.headers['X-Ratelimit-Remaining']), limit - self.outgoing)
 
         # The checks below combats out-of-order responses and alternating sub ratelimits.