Only get properties at export time if we don't already have them

lib/classes/commands/RegionCommands.ts

@@ -398,6 +398,17 @@ export class RegionCommands extends CommandsBase
         return this.currentRegion.resolver.getInventories(objects);
     }
 
+    public async fetchObjectCost(object: GameObject): Promise<void>
+    {
+        return this.currentRegion.resolver.getCosts([object]);
+    }
+
+    public async fetchObjectCosts(objects: GameObject[]): Promise<void>
+    {
+        return this.currentRegion.resolver.getCosts(objects);
+    }
+
+
     private waitForObjectByLocalID(localID: number, timeout: number): Promise<GameObject>
     {
         return new Promise<GameObject>((resolve, reject) =>

lib/classes/public/GameObject.ts

@@ -1515,9 +1515,18 @@ export class GameObject implements IGameObjectData
         const resolver = this.region?.resolver;
         if (resolver)
         {
-            await resolver.resolveObjects([this], { includeTempObjects: true });
-            await resolver.getInventory(this);
-            await resolver.getCosts([this]);
+            if (this.resolvedAt === undefined)
+            {
+                await resolver.resolveObjects([this], { includeTempObjects: true });
+            }
+            if (!this.resolvedInventory)
+            {
+                await resolver.getInventory(this);
+            }
+            if (this.calculatedLandImpact === undefined)
+            {
+                await resolver.getCosts([this]);
+            }
         }
 
         let root = xml;