Second mask in Premiere Beta Color Mode creates black vignette/offset mask artifact

I’m using Premiere Pro Beta in the new Color workspace/mode.

When I create one mask, it works normally. But as soon as I add a second mask, Premiere creates black vignette-like artifacts/black blocks on the image. Also, the mask appears to shift or affect a different area than where I placed it.

In the Program Monitor, the mask outline is in the correct place, but the actual masked effect seems offset/misaligned. It looks like the mask position and the rendered result don’t match.

This happens when adding a second mask in the Color panel. I’m not sure if it’s a GPU/rendering issue or a bug with multiple masks in the new Color Mode.

Has anyone else experienced this?