I’m playing a guardian and I have a elite skill that makes me invulnerable. In S PvP (haven’t tried in any other game mode) it happens a lot that when I’m escaping I turn it on, a couple of “Invulnerable” sign appear but then I get downed, before the invulnerability has ended. It happens that I have the same problem while using skills that block all incoming attacks, but that might be due to condition damage so I can’t guarantee that that is also an bug.