Add VoiceChannel and Thread to isinstance checks

discord/state.py

@@ -1485,7 +1485,7 @@ class ConnectionState:
         self.dispatch('raw_typing', raw)
 
     def _get_reaction_user(self, channel: MessageableChannel, user_id: int) -> Optional[Union[User, Member]]:
-        if isinstance(channel, TextChannel):
+        if isinstance(channel, (TextChannel, Thread, VoiceChannel)):
             return channel.guild.get_member(user_id)
         return self.get_user(user_id)