[v6] - Drawer with `withinPortal={false}` renders and empty `<div>`

[tall gazelle]

Not sure if its intended, but when rendering a Drawer component and setting withinPortal={false} a "placeholder" div is rendered.
I tried keepMounted={false} (even though it's false by default) but it did nothing.
It didn't happen on v5.

[random granite]

https://codesandbox.io/s/vigorous-microservice-tj7377?file=/src/App.tsx

[tall gazelle]

there's an empty div for of the drawer when it's closed

[random granite]

It is required for animations to work