[Hidden] css differs from js implementation

[ohlr]

[Hidden] css differs from js implementation with respect to Grid.

https://codesandbox.io/s/friendly-chatelet-hg2ne?file=/src/Demo.js

(you need to reduce the width of the window to see the buttons)
The js Hidden is full width. The css Hidden is reduced width.

I have seen you want to remove Hidden within v5. Maybe you should provide reference examples how to make implementations equivalent with respect to Grid.
Here only js implementation is demonstrated.

[oliviertassinari]

@ohlr This is expected, one has an extra div element (CSS) to make it work. Add a div to the js implementation, it will be equivalent.

Closing for #19704.