Cache voice members on start up if MemberCacheFlags.voice is enabled

Fix #8209

discord/guild.py

@@ -519,22 +519,23 @@ class Guild(Hashable):
             scheduled_event = ScheduledEvent(data=s, state=state)
             self._scheduled_events[scheduled_event.id] = scheduled_event
 
+        self.owner_id: Optional[int] = utils._get_as_snowflake(guild, 'owner_id')
+        self.afk_channel: Optional[VocalGuildChannel] = self.get_channel(utils._get_as_snowflake(guild, 'afk_channel_id'))  # type: ignore
+
+        for obj in guild.get('voice_states', []):
+            self._update_voice_state(obj, int(obj['channel_id']))
+
         cache_joined = self._state.member_cache_flags.joined
+        cache_voice = self._state.member_cache_flags.voice
         self_id = self._state.self_id
         for mdata in guild.get('members', []):
             member = Member(data=mdata, guild=self, state=state)  # type: ignore # Members will have the 'user' key in this scenario
-            if cache_joined or member.id == self_id:
+            if cache_joined or member.id == self_id or (cache_voice and member.id in self._voice_states):
                 self._add_member(member)
 
         self._sync(guild)
         self._large: Optional[bool] = None if self._member_count is None else self._member_count >= 250
 
-        self.owner_id: Optional[int] = utils._get_as_snowflake(guild, 'owner_id')
-        self.afk_channel: Optional[VocalGuildChannel] = self.get_channel(utils._get_as_snowflake(guild, 'afk_channel_id'))  # type: ignore
-
-        for obj in guild.get('voice_states', []):
-            self._update_voice_state(obj, int(obj['channel_id']))
-
     # TODO: refactor/remove?
     def _sync(self, data: GuildPayload) -> None:
         try: