Adding group to channel is not handled

[dblock]

Adding a group to a channel incorrectly renders:

Item should be the group.

{
    "id": 27512961,
    "action": "is collaborating with",
    "bulletin_id": 27530673,
    "connector": "on",
    "created_at": "2022-01-06T17:59:09.350Z",
    "item_id": 9178,
    "target_id": 1367590,
    "parent_id": 126988,
    "item_type": "Group",
    "target_type": "Channel",
    "parent_type": "Membership",
    "item": null,
    "target": {
        "id": 1367590,
        "title": "Test Channel",
        "created_at": "2022-01-05T21:31:39.574Z",
        "updated_at": "2022-01-08T01:37:33.719Z",
        "added_to_at": "2022-01-06T17:59:22.353Z",
        "published": true,
        "open": false,
        "collaboration": true,
        "collaborator_count": 3,
        "slug": "test-channel-1527426363",
        "length": 5,
        "kind": "default",
        "status": "closed",
        "user_id": 8683,
        "metadata": { "description": "moodboard" },
        "contents": null,
        "share_link": null,
        "follower_count": 3,
        "can_index": true,
        "owner_type": "Group",
        "owner_id": 9178,
        "owner_slug": "example-design",
        "nsfw?": false,
        "state": "available",
        "user": {
            "id": 8683,
            "created_at": "2015-11-10T15:51:37.992Z",
            "slug": "daniel-doubrovkine",
            "username": "Daniel Doubrovkine",
            "first_name": "Daniel",
            "last_name": "Doubrovkine",
            "full_name": "Daniel Doubrovkine",
            "avatar": "https://arena-avatars.s3.amazonaws.com/8683/small_5ac8881f8778e6793c2177d4b63edfb2.gif?1641416760",
            "avatar_image": { "thumb": "https://arena-avatars.s3.amazonaws.com/8683/small_5ac8881f8778e6793c2177d4b63edfb2.gif?1641416760", "display": "https://arena-avatars.s3.amazonaws.com/8683/medium_5ac8881f8778e6793c2177d4b63edfb2.gif?1641416760" },
            "channel_count": 67,
            "following_count": 132,
            "profile_id": 36305,
            "follower_count": 129,
            "initials": "PC",
            "can_index": true,
            "metadata": {
                "description": null
            },
            "is_premium": true,
            "is_lifetime_premium": false,
            "is_supporter": false,
            "is_exceeding_connections_limit": false,
            "is_confirmed": true,
            "is_pending_reconfirmation": false,
            "is_pending_confirmation": false,
            "badge": "premium",
            "base_class": "User",
            "class": "User"
        },
        "group": {
            "id": 9178,
            "class": "Group",
            "base_class": "Group",
            "created_at": "2022-01-05T21:04:16.765Z",
            "updated_at": "2022-01-05T21:08:30.035Z",
            "name": "company design",
            "description": "design @ company ",
            "visibility": 0,
            "slug": "example-design"
        },
        "base_class": "Channel",
        "class": "Channel"
    },
    "parent": null,
    "user": {
        "id": 8683,
        "created_at": "2015-11-10T15:51:37.992Z",
        "slug": "daniel-doubrovkine",
        "username": "Daniel Doubrovkine",
        "first_name": "Daniel",
        "last_name": "Doubrovkine",
        "full_name": "Daniel Doubrovkine",
        "avatar": "https://arena-avatars.s3.amazonaws.com/8683/small_5ac8881f8778e6793c2177d4b63edfb2.gif?1641416760",
        "avatar_image": { "thumb": "https://arena-avatars.s3.amazonaws.com/8683/small_5ac8881f8778e6793c2177d4b63edfb2.gif?1641416760", "display": "https://arena-avatars.s3.amazonaws.com/8683/medium_5ac8881f8778e6793c2177d4b63edfb2.gif?1641416760" },
        "channel_count": 67,
        "following_count": 132,
        "profile_id": 36305,
        "follower_count": 129,
        "initials": "PC",
        "can_index": true,
        "metadata": {
            "description": null
        },
        "is_premium": true,
        "is_lifetime_premium": false,
        "is_supporter": false,
        "is_exceeding_connections_limit": false,
        "is_confirmed": true,
        "is_pending_reconfirmation": false,
        "is_pending_confirmation": false,
        "badge": "premium",
        "base_class": "User",
        "class": "User"
    }
}