Feral mine encounter does not end even when there are no enemies nearby

Bug report reference number is 948,660,322.
Azurite Mine level:81 Trying to get Feral items. Cleared all opponents (literally standing on the end point as my golem runs around and I type this) and the encounter refuses to end (mine machine that you follow is still shaking and vibrating on the circle) and the chest is still locked.
Playing the current league using the official client (and not in a sub-league).