New topics on Message Bus

Dev
1

A message bus channel for a topic that was just created does not have any messages regarding the first post. However the last message id is not 0. Is this indented behavior?

2

For example the backlog for this topic is

[
    {
        "global_id": 272370861,
        "message_id": 2,
        "channel": "/topic/369717",
        "data": {
            "type": "localized",
            "id": 1791073
        }
    },
    {
        "global_id": 272370917,
        "message_id": 3,
        "channel": "/topic/369717",
        "data": {
            "type": "localized",
            "id": 1
        }
    },
    {
        "global_id": -1,
        "message_id": -1,
        "channel": "/__status",
        "data": {
            "/topic/369717": 3
        }
    }
]

Message with id of 1 (which I assume is the post creation message) is missing.