This was legitimately an accident.
The config file for the creature had a lot of incorrect and old code attached to it so it was cleaned up (this is common practice when we touch stuff). When being cleaned up, the aggressive parameter was also removed by accident it seems. It's pretty unlikely we'd make the main challenge of the quest be removed - we've all ran through at level 3 to get the quick combat levels and know that the moss giant is what makes it the challenge it is.
All will be resolved next week - both the moss giant and creatures not in the area.