Fix Template.source_guild attempting to get from cache

discord/template.py

@@ -69,6 +69,10 @@ def self_id(self):
     def member_cache_flags(self):
         return self.__state.member_cache_flags
 
+    @property
+    def cache_guild_expressions(self):
+        return False
+
     def store_emoji(self, guild, packet) -> None:
         return None
 
@@ -146,18 +150,11 @@ def _store(self, data: TemplatePayload) -> None:
         self.created_at: Optional[datetime.datetime] = parse_time(data.get('created_at'))
         self.updated_at: Optional[datetime.datetime] = parse_time(data.get('updated_at'))
 
-        guild_id = int(data['source_guild_id'])
-        guild: Optional[Guild] = self._state._get_guild(guild_id)
-
-        self.source_guild: Guild
-        if guild is None:
-            source_serialised = data['serialized_source_guild']
-            source_serialised['id'] = guild_id
-            state = _PartialTemplateState(state=self._state)
-            # Guild expects a ConnectionState, we're passing a _PartialTemplateState
-            self.source_guild = Guild(data=source_serialised, state=state)  # type: ignore
-        else:
-            self.source_guild = guild
+        source_serialised = data['serialized_source_guild']
+        source_serialised['id'] = int(data['source_guild_id'])
+        state = _PartialTemplateState(state=self._state)
+        # Guild expects a ConnectionState, we're passing a _PartialTemplateState
+        self.source_guild = Guild(data=source_serialised, state=state)  # type: ignore
 
         self.is_dirty: Optional[bool] = data.get('is_dirty', None)