What to display Table.EXPAND_COLUMN in children column?

[UnderMountain96]

Reproduction link

https://ant.design/components/table#expandable

Steps to reproduce

This sample is not working, it displays expandIconColumnIndex=0 and creates an empty column in the desired position:

 const columns = [
        // here display expand column
        {
            title: 'ID',
            dataIndex: 'id',
            key: 'id',
        },
        {
            title: 'Created_at',
            dataIndex: 'created_at',
            key: 'created_at',
        },
        {
            title: 'Publication',
            children: [
                {
                    title: 'Title',
                    dataIndex: 'title',
                    key: 'title',
                },
                {
                    title: 'Author',
                    dataIndex: 'author',
                    key: 'author',
                },
                Table.EXPAND_COLUMN, // here display  empty column
            ],
        },
        {
            title: 'Note',
            dataIndex: 'note',
            key: 'note',
        },
       ]

What is expected?

Displays expand column in children column "Publication"
Columns -> 'Publication' -> EXPAND_COLUMN

What is actually happening?

Displays 2 column, first column of index 0 default expand column, second column of index 4 empty

Environment	Info
antd	5.16.4
React	React 18.2.0
System	Windows 11
Browser	Google Chrome

[zombieJ]

Table.EXPAND_COLUMN not support as sub column yet.

[github-actions]

Hello @UnderMountain96. We totally like your proposal/feedback, welcome to send us a Pull Request for it. Please send your Pull Request to proper branch (feature branch for the new feature, master for bugfix and other changes), fill the Pull Request Template here, provide changelog/TypeScript/documentation/test cases if needed and make sure CI passed, we will review it soon. We appreciate your effort in advance and looking forward to your contribution!

你好 @UnderMountain96，我们完全同意你的提议/反馈，欢迎直接在此仓库 创建一个 Pull Request 来解决这个问题。请将 Pull Request 发到正确的分支（新特性发到 feature 分支，其他发到 master 分支），务必填写 Pull Request 内的预设模板，提供改动所需相应的 changelog、TypeScript 定义、测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献。