Bug In Wynnexcavation Siteb Quest

I have reached the end of the cave with the large purple crystal. However there are no purple crystals on the ground. Is this a bug or am i supposed to do something before hand. I have already talked to all the quest NPC's in the quest. I can leave the room fine, but there is no way to complete the quest, therefore no way to continue the quest line. Help?

 

This has been happening to a lot of people with Quests that require you to pick up drops from the ground. This includes Wynn Exc. Site C, Spider Forest (I think), Beneath the Depths and now Wynn Exc. Site B. I believe they are currently fixing these, so I don't think the quest is currently finish able.