Hidden Grotto - Corrupted Nexus Boss doesn't spawn

Bug Report ID: #2667828351

Killed the giant skeleton boss at the end of the map, but the corrupted boss never spawned. Corrupted nexus is cleansed, but I received no atlas points since I didn't kill the boss.

Happened to me as well, forgot to create bug# :(

Hidden Grotto, killed the boss, map marked as completed, other maps around are cleansed but the corrupted boss did not appear, and I did not get any atlas points.

Not sure if these are related but:
- I entered the boss area before killing all rares in the map.
- The map had 3 respawn portals, and I died on my first attempt. Killed the boss on the second try.