Well I have never seen my Coyote brown tarp do that. Perhaps because the undergrowth here is pretty dense as forests here are are not pruned like a park like they look in England. So you are pretty much well camoflaged in your camp jsut a few meters off the path or road. And under the canopy of the trees there ain't much sun that will hit the tarp those few days that it's not over cast. I was actually quite happy that it blend in so well, and really surprised at how well it blend in contrasted with snow. I.e dark trees and rock faces, white snow. It's so contrasty that the tarp almost looks like a shadow.
But again, form what I have seen on UK Bushcraft videos, your forests are pretty open compared to the "jungle" I am used to.
And I always use a hammcok, so I am always under trees...