Layer scale screws up physics body

Hi!
Im testing a fake zoom in ( changing layer scale) and I found this problem:

  • I have a few physics bodies of X size
  • after doing a LAYER->setScale(0.5) all of my bodies appear to be (to screen) half size … as expected. EXCEPT ONE.

the sprite size is reduced to half, but the physicsBody still the same scale than before. It didnt change.
example (showing with debug):

Maybe its a coincide, but its the only CIRCLE collider
Any ideas why is this failing?
is this a bug?