Lights cannot be fully animated, as only the first and last keyframes can be edited. Attempting to edit any keyframes in the middle will simply edit the first keyframe.
Might just be me not getting all the behavior of the program but from a quick check it seems like the first and last keyframes of a light layer are hardcoded in Scripts/Layers.cs#L574
Lights cannot be fully animated, as only the first and last keyframes can be edited. Attempting to edit any keyframes in the middle will simply edit the first keyframe.