physicCollider - onPostSolve() contact.getImpulse() not work

[ancomchancanh]

I’ve tested many times to find out contact.getImpulse() will always return

{
     normalImpulses: cc.v2(0,0),
     tangentImpulses: cc.v2(0,0)
}

Is this a feature or a bug?
I need to get the impulse casted to a rigidBody in a physic-collision to see if it node should be broken.

Anyone experienced this?
I’ve found that no one asked this in this forum as well as Google. How weird!

[ancomchancanh]

My lastest test revealed that if collision caused by node running action will always make contact.getImpulse() return 0.
But if I call rigidBody.applyForceToCenter(...) then onPostSolve() contact.getImpulse() return a positive number.

For anyone who struggle this in the past & furture.