Breadcrumb block types are now supported in the API

Notion has added support for adding and retrieving Breadcrumb block types.

You can now can add Breadcrumb blocks to pages and other blocks.

Below is an example response from Append block children containing a Breadcrumb block uploaded to Notion.

{
    "object": "list",
    "results": [
        {
            "object": "block",
            "id": "block-id",
            "created_time": "2021-10-14T18:10:00.000Z",
            "last_edited_time": "2021-10-14T18:10:00.000Z",
            "has_children": false,
            "archived": false,
            "type": "breadcrumb",
            "breadcrumb": {}
        }
    ],
    "next_cursor": null,
    "has_more": false
}

Notion API changelog: https://developers.notion.com/changelog/breadcrumb-block-types-are-now-supported-in-the-api

notion-dotnet / notion-sdk-net

Breadcrumb block types are now supported in the API #181