Its still persisting in Ashral heart too. Especialy when u die, something brakes in mechanism and the shield from heart doesnt go down even when the mobs r stunned.

U can kill those mobs tough, DOTs from skills like Nox bolt do some dmg to hem. I killed one this way .
But shield is still not going down.

I think u just cant die, never, even rev with plat doesnt help. Or at least one of party members should be still alive, u cant die all at once.
Thats what i observed so far.

Hard to say if they will actually look on this. U may just get replay that Customer support will check on it haha. Well in this case maybe they can help - to refund the plat u spend.