I was testing the beta making some animations and I realize that when I insert a new keyframe (onion skin is activated), the old keyframe disappears instead of turning into red and lowing its opacity. Also, when I come back to the first keyframe and then to the new keyframe, the old one will be fine this time (red and low opacity).

Another issue that I've noticed is that, when you jump between keyframes, the opacity and color of the frames get pretty messed up. For example, let's say I have 3 keyframes (1, 2 and 3). If I'm working on the keyframe 3 and the jump back to the frame 2 everything works fine (the opacity and the color of the next frame are ok according to the onion skin presets) However, if I then jump to the frame 1 and then to the frame 3 the line becomes dark green instead of just black (assuming I'm using black as the color of the line) 

Reproducible: Always

Steps to Reproduce:
1 - Open a new file
2 - Make a keyframe
3 - Make sure to turn ON the onion skin with colors (red and green)
4 - Draw something
5 - Create a new keyframe (few frames forward in the animation timeline)  
6 - The previous keyframe will disappear instead of being affected by the onion skin


Actual Results:  
The previous keyframe will disappear instead of being affected by the onion skin

Expected Results:  
The previous keyframe should be red and low opacity (affected by the onion skin)