Possible Bug: blind follow stops at bushes even when enemies are revealed by SIGHT

Playing Kog'maw it seems like there is a bug as follows:

When his dead mode is chasing someone to try to blow them up, I usually just right-click on them and let it auto-follow them. But when they enter bushes it will stop and not follow them. THE PROBLEM is that I believe this is happening even when the enemy is for some reason revealed, in other words the bushes should not cloak them because of ("sight" has been applied to them from "Living Artillery" is the specific example I believe I have seen a few times) a ward in the bush or etc. This may be a problem not only with Kog'maw but with the auto-follow and bushes generally, I don't know. Or it may be specific to the sight gained from "Living Artillery", or....

Maybe it is a known thing, but I tried to do a search on it and didn't find anything. Also, due to the mental fog of war when I am chasing someone right after dying I may be mistaken about what I have seen; it is hard to test to be sure.... but I believe I have seen it happen at least a few times as I described, where they run into the bush but never disappear into the bush, yet the auto-follow does not continue to follow them even though their character remains visible on the screen the whole time.

Thanks. Keep up the great work on this great game.