recon laser designate targets that sustain damage

I completed this yesterday, Im semi-convinced its bugged depending on the map. 

I was painting targets manually (holding it in hand, scoping in, holding down left click to paint) and spent 3 matches on Eastwood and one on Manhattan Bridge trying to get this challenge. Was getting vehicle destroyed assists all over the place but no damage being registered on the challenge. 

It was only when I played on Firestorm and Mirak Valley that damage started to be counted and I completed the challenge.