How to reproduce:

1. Open attached project
2. Open scene ColorShifter.unity
- Scene contains a script that controls sprite animator speeds by using the JL and IK keys.
- The I and L keys increase the speed of their respective animators and the K and J keys decrease it.
3. Play scene and immediately start holding K
- Note how one of the sprites completely freezes and stops animating
- Holding I for a few seconds (longer than K was held) will cause the animator speed to go back into positive values and the animation will eventually begin playing again
- Holding P will cause both animations to animate at 10x speed. Releasing P will reset the animator speeds to 1