I was playing as a Resto Healer (Tier 8, as I haven’t played Resto (or any Healer) since Legion) in Undercity and the first time I faced the Boss and cast Earth Elemental it was consumed by the Bosses Black Hole attack (second time I cast it when Tank Brann, eventually, moved them out of the Black Hole).
When it took out G:FG when playing Demo, it was annoying, but taking out the Earth Elemental was a real problem, especially as, without him, the Boss directed their ranged attack at me meaning I spent more time healing myself than I did Tank Brann!