What happen :
Shadow chaser can copy Crazy Weed and Earth Drive. Using this skill will remove casted manhole ground unit. Because manhole effect is not removed even after the unit is removed, Shadow Chaser can theoretically infinitely trap a player inside manhole.
The Idea :
Crazy Weed and Earth Drive is modified to not remove casted manhole ground unit. But this will nerf Genetic and Royal Guard. So, my idea is to check who casted Crazy Weed and Earth Drive, if its casted by Genetic or Royal Guard, then it will still remove casted manhole ground unit, but if casted by Shadow Chaser, it will not remove it. With this case, Infinite Manhole Trapping can still happen, but at least you need 2 player / character to do it.
Last tested works with githash a49a1a52a3e0036c9cad3794c4db5628f088b443
Edit :
With this diff, Shadow Chaser can still copy Crazy Weed and Earth Drive, and works like normal except against Manhole. Original skill behavior from genetic and royal guard does not affected.