I took the quest, completed the quest, but the text over the boat on the map stayed as "Help xyz" and the icon remained an outline.
Porting to the nearby wayshrine then riding back to where the quest ended the triggered the "Discovered" notification and the text changed to "You helped xyz" and the icon became solid.
Edited by Gabriel_H on November 15, 2025 4:26AM PC EU
Never get involved in a land war in Asia - it's one of the classic blunders!