Arena doesn't give CP all the time you win
Sometimes I've realized that when I win an arena, I don't get the respective CPs, ie 0 CPs.
I've realized that this happens when some of the members of the opposite team leaves the arena before it's killed, because his partner is already dead. But the weird thing is that it doesn't happen all the time, because sometimes, I receive my CPs when the member leaves.
So my question is: What's going on here? Why sometimes I don't receive my CPs when a member leaves? Is it a bug or it's on purpose?
If this is on purpose, it's exploitable, since it has happened a few times now, with different chars.
P.S. Once I didn't even receive my CPs even when my team killed both members of the opposite team.