Is MovieClip.isPlaying property reporting incorrectly?

The isPlaying property is reporting incorrectly. All MovieClips by default starts playing, but when you check this property, it is false by default until you call the play function. Anyone else experiencing this?

To replicate:

1. Create a MovieClip instance on the stage.
2. Give it an instance name (ie, box_mc)
3. in AS3, type the following:
   
   trace(box_mc.isPlaying)

You should see false being traced out.

(Tested in Flash Professional CS6)