Username changes in Telegram do not have icons in Slack

[chrissexton]

On the backend:

Message{
        ID: "6810"
        From: User{
                ID: "256030111"
                Nick: "flyngpngn"
                FullName: "The Hammer"
                DisplayName: "The Hammer"
                PhotoURL: "https://bridge.chrissexton.org/telegram/media/AgADAQADqacxG5-1Qg9nlsma6alBl96g0i8ABIW9ijgjwnCLvqkBAAEC"
        }
        Text: "(fucking with the bridge and profiles... looks like we have some holes)"
}
Message{
        ID: "6811"
        From: User{
                ID: "256030111"
                Nick: "flyngpngn"
                FullName: "flyngpngn"
                DisplayName: "flyngpngn"
                PhotoURL: "https://bridge.chrissexton.org/telegram/media/AgADAQADqacxG5-1Qg9nlsma6alBl96g0i8ABIW9ijgjwnCLvqkBAAEC"
        }
        Text: ":D"
}

On Slack:

[eaburns]

Curious, because both have the same photo URL, and username isn't used as a key for looking up a user's profile.