What happened:
Layers are popping in and out of view when the sprite mask moves. See attached gif for more detail.

How we can reproduce it using the example you attached:
1) Open custom-range scene
2) Move New Sprite Mask (shades) across the 5 sprites
3) Observe that blue green and yellow are invisible inside the mask, but red and white pop in and out

Expected result:
The red and white squares should not be affected by the mask moving over them

Actual result:
The red and white squares pop in and out of view

Windows only