Same for me.

I still have the issue. I have tried North Side, South Side, hiding in forest, hiding in houses, sprinting from the landing smoke as far as I can and I always get the same.

Link to my save:

https://dl.dropboxusercontent.com/u/59910429/save6.Arma3Save

I also have this problem. It occurs when I hide in the trees, hide in the houses, or even run as far as I can from the helicopter's line of sight. The helicopter appears to spot me whatever I do.

This is a great idea. My biggest issue with playing Arma 2 into the night was being startled by the glare every time I opened the map.