Ubuntu 14.04 64x
Keyframes in LayerMask "Opacity" or "Invert the mask B/W" can be created. These keyframes exist in an existing Action (can be seen in Outliner - Actions and has datapath), but they don't appear in DopeSheet - DopeSheet nor DopeSheet - Mask. They can't be modified as the other keyframes. Nor changing its type (keyframe, interpolation, handle).
- Open this file:
- Check the MaskLayer Opacity animation by going from 10 to 20 and back. Keyframes are visible only in the slider (as yellow slider).
- The same with "Invert the mask B/W". Frame 30 and 40 have keyframes.
EDIT: file uploaded.