It's most likely a distance and weather issue rather than time of day. Before 1.4 I had issues with detecting enemies in fog, even though I could clearly see their reflection because of ROW, and the game arbitrarily wouldn't let me detect the enemy until it was less than 1000 or so yards away.
It could also be due to the target's proximity to the marker on your map. Try aiming at something as close to the marker as possible, and try to very close to the marker yourself.
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