Fix engine errors

engine/Scene.ts

@@ -167,6 +167,7 @@ export async function setScene(name: string): Promise<void> {
 		postProcess();
 	}
 
+	const previousSceneData = currentScene.data;
 	currentScene.data = data;
 	self.dispatchEvent(new Event("resize"));
 
@@ -174,7 +175,7 @@ export async function setScene(name: string): Promise<void> {
 	currentScene.process = process;
 
 	for (const callback of sceneChangeSet.values()) {
-		callback(data, currentScene.data);
+		callback(currentScene.data, previousSceneData);
 	}
 }