fix first chunks were not loaded if they were transmitted via background connection before the position was received via foreground connection

FactoryCraft/World.cpp

@@ -76,6 +76,7 @@ World::~World()
 
 void World::update(bool background)
 {
+    if (background && currentDimension->getId() < 0) return;
     NetworkReader* serverMessageReader = 0;
     unsigned char type = 0;
     while (background