Give an example when componentWillMount can be called multiple times

I've found such phrase on this page https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html about componentWillMount callback:

The above code is problematic for both server rendering (where the external data won’t be used) and the upcoming async rendering mode (where the request might be initiated multiple times).

The same problem is described for componentWillUpdate and componentWillReceiveProps.

If I'm not mistaken it means that this function can be executed multiple times for one component if I use async rendering. I've found such question on StackOverflow: https://stackoverflow.com/questions/54533907/react-componentwillupdate-getting-called-twice about the same problem. I think I understand theoretical possibility of case when componentWillMount will be called twice: it can happen when mouning and initial rendering of some component was interrupted with higher priority task, so mounting restarts and calls componentWillMount again. Unfortunately neither documentation nor StackOverflow has any practical example of code which cause multiple calls of componentWillMount.

I've tried to make such an example myself using experimental React.JS version but has no luck.

I think it's better to have such an example to allow people who is not an expert in React.JS source code to under problem of such lifetime callbacks usage. I understand that it's an experimental feature and it can be changed in future but it's easier to understand the conception of async rendering when you have practical examples of possible problems.

まず、リンクされているReactブログ記事と参照されているStack Overflowの質問を読み、次にasync-renderingのライフサイクルに関するガイダンスが記載された関連ドキュメントページを確認します。ドキュメントに、componentWillMountが複数回呼び出される可能性を示す実践的な例が含まれ、その結果生じる使用上の懸念が明確に説明されていれば、作業は完了です。