Shadow Priests are close to immortal in Awakened Raids as they're self-healing for crazy amounts!
Unlike Devastation Evokers, Monks and Assassination Rogues, who are still bugged to do less damage in Awakened Raids, Shadow Priests seem to be bugged in a good way, getting a crazy amount of self healing in Awakened Raids.
Devouring Plague is currently healing for ~133% the damage done instead of the intended 30% when inside Awakened Raids.
This basically makes them close to immortal, even on some of the most healing intensive fights like Kurog Grimtotem.
When not inside Awakened Raids, Devouring Plague healing functions as normal.