Krugs Bug
So normally when you hit a camp and get a certain distance away, they will start losing patience and eventually reset to their spawn location.
When a Krug splits into two smaller Krugs, they use the location where they appeared as their spawn location instead of the original Krug camp location. This changes where you can leash them to, and where they reset to, which means we no longer know where we can leash them to at all (smaller Krugs don't even have a patience meter so you can't tell when you've brought them too far).