Leak with extended vs not extended

cocos2d-x JavaScript
1

Hello,

We are experiencing a leak when using a custom sprite extended from cc.sprite.The same code using cc.sprite directly does not leak.
I attach our testing code:

http://pastebin.com/z7APtRNq
http://pastebin.com/ria700Vs
http://pastebin.com/ueFMuxXR

Also is there any way to control leaks? A profiler and some tutorial on how to do it would be great.

Thanks!
P.D: This happens with 3.6.1