Broken: 2.80, APr 7 build
Short description of error
Once a mask is drawn, and a key frame set, I set another keyframe a few frames later. As I step through the frame sequence (PNG files), the mask does not interpolate correctly. It's position does not line up where it should be.
Exact steps for others to reproduce the error
Draw and animate a mask, putting keyframes 3 or 4 frames apart. As you go between them to adjust, the mask does not update/display correctly. I've attached the file it happened to me on, but cannot include the frame sequence because it's an unreleased client project.