Fix AiWander::fastForward using incorrect pathgrid coordinates when actor recently moved to a new cell

apps/openmw/mwmechanics/aiwander.cpp

@@ -669,6 +669,9 @@ namespace MWMechanics
         MWBase::Environment::get().getWorld()->moveObject(actor, static_cast<float>(dest.mX), 
             static_cast<float>(dest.mY), static_cast<float>(dest.mZ));
         actor.getClass().adjustPosition(actor, false);
+
+        // may have changed cell
+        mStoredAvailableNodes = false;
     }
 
     void AiWander::getAllowedNodes(const MWWorld::Ptr& actor, const ESM::Cell* cell)