So preservation evokers don’t have access to a (either) dispel or (either) rez until level 59 and are unable to do either when scaled down in time walking leveling dungeons below level 59…. which is sorta kinda of a big deal when you are trying to help a buddy in leveling dungeons and your role is heals.
I’m goin to just assume this is a bug and not a design oversight that didn’t totally escape your notice through the course of several months of beta.
Can you try enabling party sync (at the bottom right corner of your quest log) if you haven’t already to see if that helps? I seem to recall there was some weird scaling and ability lockouts when I was leveling a resto druid in vanilla dungeons with another player. It’s been a few months, but I think using the party sync worked. At the time, we were both in Chromie time, so I’m not sure if the interaction also works for above 60s. I think when party sync was enabled, I was not scaled back in level since it technically scales you to 60 (was 50), but when it wasn’t, I scaled down to 30 by default upon entering the dungeon and lost my abilties. I’m going off of my memory, so I hope that is accurate. Worth a try, though!