Actual Boss not spawning during Mapping - Sulphuric Caverns

Not sure if anyone else has run into this, but I'm guessing it's an issue with the changes made with the most recent update. The boss is the bone mammoth/mage dude that you fight in the Bone Pits during the Act 2 trip to collect the mammoth tusk.

During mapping the boss arena appeared, but only the mammoth spawned. After killing the mammoth the map is registered as complete, but no loot drops as all the loot drops are tied to the mage half of the boss that did not spawn. This also trapped me in the boss room requiring me to switch characters to resolve it.

Not a big deal, just want to make sure it's reported. :)

Same here! got the same boss my last 3 Boss maps and it always happend ;(

+1, bug report video: https://youtu.be/n91sGuIcWrE