I struggled with this for awhile as well. Tried setting the mask in the scene editor or programitcally and both had the same issue. I then decided to add a 2x and 3x image to the project which was never required for SpriteKit textures in the past and everything started working.
cloken
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This is happening to me as well. A few additional details:
Running Monterey with Xcode 12 and Xcode 13 beta 1 installed. Everything was working, I could do my normal work in Xcode 12, but still play around with new features in Xcode 13. Everything worked great.
I installed Xcode 13 beta 2, which also included an install of the command line utilities. This is when the problem started, Xcode 12 could no longer use the debugger and I had to disable it in the scheme to at least test on the simulator.
I tried reinstalling the command line tools for Xcode 12 thinking it would help, but it didn't. Debugger works fine on Xcode 13, but I can't do production work there since the app would not be approved on the App Store.