如何用Notion API（Python）读取块提及？2022-06-28版本暂不支持

编辑说明：该功能目前暂不支持（Notion版本：2022-06-28） #

我用Python 3开发集成工具，用来重新格式化已录入的Notion页面，但发现粘贴其他块的链接并选择「提及块」后，通过API读取不到对应块的文本内容。父页面已经添加到我的集成中，但接口返回的富文本是空的。

目前页面提及、用户提及都能正常读取，只有块提及不行——是不是这个功能暂不支持？

我用GET请求访问https://api.notion.com/v1/blocks/{block_id}，请求头如下：

{
    "Authorization": f"Bearer {NOTION_SECRET}",
    "Content-Type": "application/json",
    "Notion-Version": "2022-06-28",
}

这是它在Notion中的显示效果：
复制链接后选择“提及块”选项的显示截图

我期望提及的块返回内容如下：

{
    "archived": False,
    "bulleted_list_item": {
        "color": "default",
        "rich_text": [
            {
                "annotations": {
                    "bold": False,
                    "code": False,
                    "color": "default",
                    "italic": False,
                    "strikethrough": False,
                    "underline": False,
                },
                "href": None,
                "plain_text": "This is my test block I want to mention it later",
                "text": {
                    "content": "This is my test block I want to mention it later",
                    "link": None,
                },
                "type": "text",
            }
        ],
    },
    "has_children": False,
    "object": "block",
    "type": "bulleted_list_item",
    # etc.
}

但实际包含提及的行返回内容是这样的：

{
    "archived": False,
    "bulleted_list_item": {
        "color": "default",
        "rich_text": [
            {
                "annotations": {
                    "bold": False,
                    "code": False,
                    "color": "default",
                    "italic": False,
                    "strikethrough": False,
                    "underline": False,
                },
                "href": None,
                "plain_text": "In this line, I will mention the block before by right-clicking, using the “Copy link to block” action, then pasting and selecting the “Mention block” action: ",
                "text": {
                    "content": "In this line, I will mention the block before by right-clicking, using the “Copy link to block” action, then pasting and selecting the “Mention block” action: ",
                    "link": None,
                },
                "type": "text",
            }
        ],
    },
    "has_children": False,
    "object": "block",
    "type": "bulleted_list_item",
    # etc.
}

如果是单独的提及行，返回内容则为：

{
    "archived": False,
    "bulleted_list_item": {
        "color": "default",
        "rich_text": [
            {
                "annotations": {
                    "bold": False,
                    "code": False,
                    "color": "default",
                    "italic": False,
                    "strikethrough": False,
                    "underline": False,
                },
                "href": None,
                "plain_text": " ",
                "text": {"content": " ", "link": None},
                "type": "text",
            }
        ],
    },
    "has_children": False,
    "object": "block",
    "type": "bulleted_list_item",
    # etc.
}

内容的提问来源于stack exchange，提问作者LetMeAdam