Echovald speaker NPCs randomly invulnerable

[Hesione.9412]

I've noticed it the past couple of days. The mobs will run in, start fighting, and then part-way through the fight they all become invulnerable. There's no buff showing on them, they can attack the player but the player does no damage to them. It's been happening at various locations, sometimes during an event (e.g. https://wiki.guildwars2.com/wiki/Stop_the_Speakers_from_stealing_Kurzick_relics ) but also random speaker NPCs outside of events. The NPCs are not resetting as their health remains at the level it was when they became invulnerable. The invuln disappears when they start running back towards you. 

[Ashantara.8731]

51 minutes ago, Hesione.9412 said:

I've noticed it the past couple of days. The mobs will run in, start fighting, and then part-way through the fight they all become invulnerable.

The same goes for most Kappa underwater mobs and other enemies we encounter. It's not limited to Speakers, unfortunately.

[Rubi Bayer.8493]

Thanks for the heads up, we're looking into this!