Animation tracks reset to ref pose when editing actor properties.

Editing an actor's properties in a sequence causes the animation to go to ref pose.

1. Create a blank actor blueprint and open it
2. Add a skeletal mesh component
3. Set the skeletal mesh to any mesh
4. Add a float variable, name it "foo"
5. Set the float variable's "Expose to Cinematics" = true
6. Drag the actor into a level
7. Create a level sequence
8. Drag the actor instance into the level sequence
9. Add an animation track to the actor 
10. Drag the time slider and observe the animation playback
11. In the details panel, set the "foo" property to a value of 1.
12. Notice the skeletal mesh returns to ref pose

Dragging the time slider will bring the animation back.

Expected Result:
The animated pose remains unchanged.

Actual Result:

The pose returns to the reference pose.