Bug UI Mask Doest Working at World Canvas Space

Unity 2020.3.27f1 (personal)
- Editor and Build
1. What happened
Masks do not work on Canvas designed for the WORLD SPACE only in Camera or Orverlay space.

2. How can we reproduce

- Create a UI Canvas
- Change to World Space
- Create a Image as Children of Canvas.
- Create a other Image, now as Child of First Image.
- Add UI Mask at parent Image.
- The mask doesnt working. The Children Image of mask is visible normaly at scene and camera view.
- If change Canvas space to Camera or overlay, the mask Work normaly.

Screen Space Overlay, its working normaly:


World Space: Doest Working:

 

Same issue here. Did you file a report?