Me and a couple friends and a couple randoms did last wish about an hour ago. We decided to do both the sunburn, and the new meta triumphs at the same time, so we were 6 warlocks, all running dawnblade. However, we did not get any check marks to the sunburn triumph, nor the triumph itself. We double checked after each encounter that everyone was using the solar tree as well. I would really like to get my hard earned triumph :( thanks already, I hope you can get it fixed.
I also put the raid from raid report there so you could see it just in case. Thanks anyway
Update: I did another last wish raid because someone told me that should fix it and give the achievement to me... Well, it did not. Please fix the bug when trying to get an elemental triumph with the new meta