Woodland map double boss bug

when doing the woodland map, if it spawns the double boss fight, they both die at the same time even if only focusing 1 of them and they drop no loot.

t15 4-6 mod map, really annoying having to do double boss mechanics, trying to not rip the map and get no reward for it.

I've done the fight 5 times today and the 3 times it spawned the double boss it gave me nothing.