A Ghoulish Fest Tier 3/3: Defend the Greenkind Warden against the Onslaught.
If you get teleported into an instance, while in the middle of defending, upon returning the defence part will not restart. Running out of bounds and back again, does not help either. There appear to be no “You are leaveing the mission area, return in x sec” nor any other reaction to running away from the area.
SOLUTION (until fixed)
Pausing and then retaking the mission. This returns you to Tier 3/3: Examine the roots of the tree.