diff --git a/src/document/migrate-scene-document.ts b/src/document/migrate-scene-document.ts
index 6f8ab127..9369885e 100644
--- a/src/document/migrate-scene-document.ts
+++ b/src/document/migrate-scene-document.ts
@@ -1,5 +1,12 @@
 import { createStarterMaterialRegistry, type MaterialDef, type MaterialPattern } from "../materials/starter-material-library";
-import { createPlayerStartEntity, type EntityInstance } from "../entities/entity-instances";
+import {
+  createInteractableEntity,
+  createPlayerStartEntity,
+  createSoundEmitterEntity,
+  createTeleportTargetEntity,
+  createTriggerVolumeEntity,
+  type EntityInstance
+} from "../entities/entity-instances";
 import {
   createBoxBrush,
   createDefaultFaceUvState,
@@ -17,6 +24,7 @@ import {
   FOUNDATION_SCENE_DOCUMENT_VERSION,
   RUNNER_V1_SCENE_DOCUMENT_VERSION,
   SCENE_DOCUMENT_VERSION,
+  WORLD_ENVIRONMENT_SCENE_DOCUMENT_VERSION,
   type SceneDocument
 } from "./scene-document";
 import { isWorldBackgroundMode, type WorldBackgroundSettings, type WorldSettings } from "./world-settings";
@@ -43,6 +51,16 @@ function expectNonNegativeFiniteNumber(value: unknown, label: string): number {
   return numberValue;
 }
 
+function expectPositiveFiniteNumber(value: unknown, label: string): number {
+  const numberValue = expectFiniteNumber(value, label);
+
+  if (numberValue <= 0) {
+    throw new Error(`${label} must be greater than zero.`);
+  }
+
+  return numberValue;
+}
+
 function expectString(value: unknown, label: string): string {
   if (typeof value !== "string") {
     throw new Error(`${label} must be a string.`);