Dig Site boss doesn't "die" causes bugs

Since the map boss in Dig Site doesn't "die", he only retreats into his rock cocoon it has caused a handful of bugs. The most annoying one that I have encountered is when Digsite is also a Corruption Nexus it doesn't spawn the Corruption boss so you can't get credit for "Cataclysm's Wake"(Complete a Tier 3/6/9/12+ Corrupted Nexus).