Running an effect only on update vs Strict mode

I have written a variation of the useEffect hook that should only run on updates. I used a useRef hook to accomplish this the way the FAQ in the old docs recommends it here:

I couldn't find the same piece in the new documentation.

The problem is that the effect still runs on the initial render when strict mode is on:
https://codesandbox.io/s/delicate-lake-88phjz?file=/src/App.js

however it behaves correctly when the strict mode is off:
https://codesandbox.io/s/hungry-wright-tl7p43?file=/src/App.js

In the former example the message is logged to the console right away even though it shouldn't be.

The possible explanations I can think of are:

1. I'm doing something wrong. Can you please point the mistake out for me?
2. The old docs are off and this is not the right way to do it. In this case can you please let me know what the right way of achieving this behavior is?
3. The strict mode is to blame. I do find it irritating at times, if I'm frank, but that's probably unlikely.

Can someone help me with this? Thanks a lot!

首先在链接的两个 CodeSandbox 示例中复现该行为，并比较 Strict Mode 和非 Strict Mode 的情况。结合旧的 FAQ 摘录阅读当前的 useEffect 和 useRef 文档；当清楚记录了跳过初始渲染的 effect 的推荐行为，或将 issue 解释为预期的 Strict Mode 行为时，即可视为完成。