Masking doesn't work when another display is in focus

[CDTR-MattConroy]

Describe the bug
When using multiple displays, and a display other than the one where the SoftMask is present is focused, the SoftMask no longer works and renders no content. When focusing the display where the SoftMask is present, then the SoftMask renders correctly again.

To Reproduce
Steps to reproduce the behavior:

1. Set up multiple canvas, each mapped to separate displays.
2. Add a SoftMask to the Canvas on Display 1.
3. Switch focus to Display 2.
4. See the SoftMask stop rendering.

Expected behavior
SoftMasks work correctly regardless of which display is in focus

Screenshots
Focused:

Not focused:

Environment (please complete the following information):

• Version 2.4.5
• Platform: Editor(Windows), Standalone(Windows)
• Unity version: 2023.2.20f1

Additional context
none

[mob-sakai]

Thank you for your reporting!

Please try to use v3.

[CDTR-MattConroy]

I have since upgraded to 3.2.2 and have the same problem. Switching the masking mode to Anti-Aliasing does not suffer the same issue however, but this is not comparable to Soft-Masking

[mob-sakai]

I would like to know more about this issue.

Could you please attach a minimal project (included Assets, Packages and ProjectSettings directories) that reproduces the issue?
Of course, you don't need to include any secret assets from your project. Feel free to use free assets instead.

[mob-sakai]

The issue is not reproduced on my environment with demo project.