Not to my knowing. But like you, as a Flash user, many times I ended up wanting to break a symbol. This feature would be welcome in a future release of Edge
Totally agree with that!
As a work around you can copy and paste the animation back on the main timeline.
1. copy the elements and paste them on the stage
2. copy the timeline transition for each element
3- select the element on the timeline
4- paste the transitions.
It is a lot of work!