I am not quite sure where to put this thread, as it is not quite a bug.  I am not sure whether this is a development oversight or not either.

The issue in question refers to the circle that orbits units when they pick up eclipse buffs.  It is shown to everyone, even when invisible or stealthed units like the Forgotten have them active on them.  The result is that you can track invisible enemy units by the little circles on the map giving them away.

I haven't taken a picture of it yet as I did not think about making this post until after it already happened in one of my games, and I used it to kill my Forgotten friend.

I will try to update this with a picture once we resume our game.