When you use ctrl+, or ctrl+. to cycle through keys in timeline clips, the behaviour of which keys are selected seems to be quite inconsistent. Depending on where the clips are positioned relative to other clips, certain keys will be missed when using those shortcuts

1. Open the attached project
2. Open the Timeline window and select the TimelineContainer object in the scene hierarchy
3. Use crtl+. and ctrl+, to cycle through keys on the timeline
4. Note that the last key on SphereMovement can be cycled to
5. Move the SphereMovement clip to the left and snap it to the end of CubeMovement
6. Use crtl+. and ctrl+, to cycle through keys on the timeline again
7. The last key on SphereMovement can no longer be cycled to