Form.List with required Form.Items bug

[bohdan-krupa]

Reproduction link

https://github.com/ant-design/ant-design/blob/master/components/form/demo/dynamic-form-items-complex.tsx

Steps to reproduce

1. Copy the code
2. Add rules={[{ required: true }]} to "first" or "second" Form.Item

What is expected?

Warning: Encountered two children with the same key, ``. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
at CSSMotionList (http://localhost:3000/static/js/bundle.js:43292:92)
at div
at DomWrapper (http://localhost:3000/static/js/bundle.js:43423:90)
at http://localhost:3000/static/js/bundle.js:43125:32
at ErrorList (http://localhost:3000/static/js/bundle.js:18720:5)
at div
at div
at http://localhost:3000/static/js/bundle.js:21106:42
at FormItemInput (http://localhost:3000/static/js/bundle.js:19586:5)
at div
at http://localhost:3000/static/js/bundle.js:21255:18
at div
at ItemHolder (http://localhost:3000/static/js/bundle.js:19030:7)
at InternalFormItem (http://localhost:3000/static/js/bundle.js:19325:5)
at div
at div
at http://localhost:3000/static/js/bundle.js:17819:18
at div
at Field (http://localhost:3000/static/js/bundle.js:36999:90)
at WrapperField (http://localhost:3000/static/js/bundle.js:37545:20)
at List (http://localhost:3000/static/js/bundle.js:37910:19)
at FormList (http://localhost:3000/static/js/bundle.js:19834:18)
at form
at Form (http://localhost:3000/static/js/bundle.js:37667:19)
at FormProvider (http://localhost:3000/static/js/bundle.js:37831:31)
at FormProvider
at DisabledContextProvider (http://localhost:3000/static/js/bundle.js:18493:5)
at InternalForm (http://localhost:3000/static/js/bundle.js:18844:62)
at App (http://localhost:3000/static/js/bundle.js:86:63)
at Router (http://localhost:3000/static/js/bundle.js:79689:15)
at HashRouter (http://localhost:3000/static/js/bundle.js:77708:5)

What is actually happening?

Warning: Encountered two children with the same key, ``. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
at CSSMotionList (http://localhost:3000/static/js/bundle.js:43292:92)
at div
at DomWrapper (http://localhost:3000/static/js/bundle.js:43423:90)
at http://localhost:3000/static/js/bundle.js:43125:32
at ErrorList (http://localhost:3000/static/js/bundle.js:18720:5)
at div
at div
at http://localhost:3000/static/js/bundle.js:21106:42
at FormItemInput (http://localhost:3000/static/js/bundle.js:19586:5)
at div
at http://localhost:3000/static/js/bundle.js:21255:18
at div
at ItemHolder (http://localhost:3000/static/js/bundle.js:19030:7)
at InternalFormItem (http://localhost:3000/static/js/bundle.js:19325:5)
at div
at div
at http://localhost:3000/static/js/bundle.js:17819:18
at div
at Field (http://localhost:3000/static/js/bundle.js:36999:90)
at WrapperField (http://localhost:3000/static/js/bundle.js:37545:20)
at List (http://localhost:3000/static/js/bundle.js:37910:19)
at FormList (http://localhost:3000/static/js/bundle.js:19834:18)
at form
at Form (http://localhost:3000/static/js/bundle.js:37667:19)
at FormProvider (http://localhost:3000/static/js/bundle.js:37831:31)
at FormProvider
at DisabledContextProvider (http://localhost:3000/static/js/bundle.js:18493:5)
at InternalForm (http://localhost:3000/static/js/bundle.js:18844:62)
at App (http://localhost:3000/static/js/bundle.js:86:63)
at Router (http://localhost:3000/static/js/bundle.js:79689:15)
at HashRouter (http://localhost:3000/static/js/bundle.js:77708:5)

Environment	Info
antd	5.19.3
React	18.2.0
System	MacOS
Browser	Google Chrome Version 126.0.6478.183 (Official Build) (arm64)

[github-actions]

Hello @bohdan-krupa. Please provide a online reproduction by forking this one or provide a minimal GitHub repository like create-react-app-antd. Issues labeled by Need Reproduce will be closed if no activities in 3 days.

你好 @bohdan-krupa，我们需要你提供一个在线的重现实例以便于我们帮你排查问题。你可以通过 fork 这个在线重现案例 ，或者提供一个最小化的 GitHub 仓库（类似 create-react-app-antd）。3 天内未跟进此 issue 将会被自动关闭。

什么是最小化重现，为什么这是必需的？