I attempted the world quest: Rocks, water and Elemental fodder which requires you to collect 20 Living Coalesced Silt, however upon gathering my 20th, it just tells me the quest failed. I tried turning off all addons and it still isn’t completing. killing additional mobs doesn’t give any more of the quest item and being a daily, I can’t drop and restart.
leave the area and go back, should auto complete the world quest.