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I have verified there is a bug with Maskgroup. To generate a MWE (minimum working example) download the example from here https://sdkdocs.roku.com/display/sdkdoc/MaskGroup 1) Edit MainScene.xml and remove the animation block entirely. 2) zip and view in FHD (1920 x 1080) 3) Change Roku display type and view in HD (1280 x 720) notice the mask coverage is different. This is a bug and renders Maskgroup unusable if the intent is to support 1080 and 720 dynamically.
If you've set you ui_resolution to FHD in your manifest, you can calculate the actual maskSize by multiplying the image size with 2/3 (0.66666) (720/1080).