Valdos maps not able to be completed

Hi ggg

I decided to open boxes for the first time. Found one map that’s bugged. I was able to clear the whole map except for 2 unique bosses (kosis and champion of the hollows). It had the mod of multiple packs of 4 bosses. All other bosses died easily but these two literally took 0 damage. I tried forever and couldn’t make any progress or complete the map.

What’s going on? I’ve seen posts about bugs with some bosses in valdos. This map had a megalomaniac cluster jewel and now it’s just thrown away…