I am experiencing a bug on every instance of this map.
When the meta starts the bar for the Mordent Forces starts at 0. I guess killing at least one enemy will lead to the next Meta event.
The problem is that it is impossible to complete the Caravan Corpse Event since the event will be skipped.
I cant finish my Vision of Istan collection due to this.
Already contacted Support and made an ingame Bug report about this. Support told me to swap instance but this didn't help.