Change land type doesn't remove kird ape's bonus

[travolter]

I found that if you control a kird ape and an unique forest land, and that land is enchanted to change its type to island for example, the +1/+2 bonus remains. Iwas checking the card code and I saw that the code check only when a card is moved, but not the change of type. However, seems that maybe we have a way to do it on the definition of that code, but i am not sure. Of course this bug affects other cards which checks for any kind of land as sedge troll, etc