I paired with a long time friend to exchange darkness buffs. Her tricks quest finished, mine did not.
Re-logging after clearing caches did not help.
Help chat signalled more players with the same problem.
Darkness buffs are 10 pumpkins, they need to be applied knowing that the strong light comes within two hours; these need to be produced as well for the next quest, with good timing -i.e. after the tricks quest is fixed... what do we ask for compensation?
In other good news - the "semataries" I planted at the same moment have timers different by as much as 2 hours.