Escorting quest can't be shared or it's only me?

Hi,
I've just started 3rd escorting quest in Darkshore that can't be shared in group (share button is gray).
After 1st person took quest NPC just started walking and others could not speak to him.
We were in party prior to taking quest.
Fun fact - one of those quests were even marked as GROUP (the absent minded prospector)...

Is it bugged / intended or we re doing something wrong?
Also did not find anything in bugtracker about it

Sup as far i remember when you are in group with people and someone starts escorting quest every member of party gets question name is starting and name of escorting quest would you like to join yes or no