Keyframes for mask opacity & feather snap at each keyframe instead of changing continuously - interpolation issue.

[cybridproductions]

Values for Opacity and Feather when working with masks don't shift smoothly between keyframes, they just flip immediately when they hit the next keyframe.

[cybridproductions]

Note - the example project shows the mask also changing shape, which interpolates fine - was just included as an example of the difference between the two issues.