$request->only() return empty array in laravel 7.9

I have a mess while laravel 5.4 to 7.9, I have read the follow document: https://laravel.com/docs/7.x/requests , but I am not clear in my case:

In laravel 5.4, it returns an array:

It's an emty array in laravel 7.9:

Thanks!

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