Yeah this is a messy one and considering it status it shouldn't be on daily objectives...
I mean you can litteraly kill dozen of invaders but if these bad boys didn't kill a guard or damage the structure with sieges (coz you know they're already dead) well tough luck you don't get credit.
I don't even bother trying to do it anymore.
I had the same issue, try to start another chapter and restart chapter 14 again from the begining.
Downside is you got to do the first part of mission again (the annoying camp dialogs)but it worked for me.
I just destroy them now honestly and keep the boxes from convergences unopenned in my bank.
It's a shame that they aren't currencies if you consider how many you get...
Yeah no, forcing players to solo a group intended content is hardly a workaround to me.
Because let's be honest who will join a party if only instance openner get credits ?
I can confirm that, and it's suuuuper annoying...
That bug has now been out for several weeks, i reported it many times with the ingame tool and there is a couple topics about it now it would be nice to at least have an answer from anet...