Screen gui elements no longer clip to the descendants when they are rotated

[KingAviationer]

So here I have a pretty basic screen gui just to show you the problem.

If I rotate the white part it no longer clips to the background and is fully visible.

Whats the best way to either fix this or work around it?

[Jab2Roblox (EpicJab)]

I have this same problem. Would love some help.

[KingAviationer]

Using viewportframes solves this

[Eiro_exe (Kepler)]

Use canvasgroup
https://developer.roblox.com/en-us/api-reference/class/CanvasGroup