Motion guide orientation changed behavior

[koko236]

I just updated from EaselJS 0.6.0 and TweenJS 0.4.1 to 0.7.1 and 0.5.1 respectively. Now I have a tween along motion guide, and 'orient' property set to 'auto'. After upgrade, the animated shape stopped orienting itself to the path. Tracing rotation property shows that the values are different after upgrade and the effect seems to be broken. Nothing changed but the libs version.

Here's jsbin with old libs: http://jsbin.com/pilidodohoki/1/edit?html,js,output

And new ones: http://jsbin.com/vezohaqopuxe/4/edit?html,js,output - you can see that the recatngle rotates a bit but is not really oriented along the path anymore.

Should it work that way? How can I get the old behavior?