set_update_listener for MessageReactionUpdated not works #2445

And for processing compatibility, i need class attributes to be match.
MessageReactionUpdated
m.from_user = m.user
Just like m.message_id and m.id in the Message class

MessageReactionUpdated
m.from_user = m.user

It's API naming.
https://core.telegram.org/bots/api#messagereactionupdated

Just like m.message_id and m.id in the Message class

m.id was old time naming mistake and is left for backward compatibility.

bot.set_update_listener(handle_messages)

It's not the update listener, but handler.
Use add_message_reaction_handler to add handler in runtime.