Leaving a guild does not unsubscribe user from guild events

[MaddyUnderStars]

Kicks and bans work as expected, however if a user leaves a guild themselves, they will continue to receive ( all? ) gateway events sent to that guild, such as MESSAGE_CREATE. This only lasts for as long as their gateway connection, as in if the user leaves a guild and then reconnects to gateway, the bug is no longer active.