Invited user sending messages without signing up

@paris-ci user is sending and receiving messages with user state INVITED. I'm unable to reproduce: When creating invite for myself and then going to https://gitter.im/settings/accept-invite/{invite-secret}?source=email-invite URL, I'm being presented with login screen.

{
    "_id": ObjectId("55bf155b0fc9f982beabf1f2"),
    "githubId": 1234,
    "state": "INVITED",
    "displayName": "Arthur",
    "invitedToRoom": ObjectId("XXXXX"),
    "invitedByUser": ObjectId("XXXXX"),
    "username": "paris-ci",
    "gravatarVersion": "4",
    "gravatarImageUrl": "https://avatars1.githubusercontent.com/u/3063324?v=4",
    "__v": 6,
    "_tv": 9,
    "emails": [
        "XXXXX"
    ],
    "inviteReminderSent": ISODate("2015-08-06T07:20:05.235Z"),
    "permissions": {
        "createRoom": true
    },
    "githubUserToken": "XXXXX",
    "identities": [],
    "lastTroupe": ObjectId("XXXX"),
    "githubScopes": {
        "user:email": true,
        "repo": true,
        "read:org": true
    },
    "githubToken": "XXXXX"
}

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☝ May 29, 2019 6:49 AM