fix(editor): restore stable map editing behavior

src/world/Environment.tsx

@@ -1,5 +1,6 @@
 import {
   GAME_SCENE_FALLBACK_BACKGROUND_COLOR,
+  GAME_SCENE_SKY_FALLBACK_MODEL_PATH,
   GAME_SCENE_SKY_MODEL_PATH,
   GAME_SCENE_SKY_MODEL_SCALE,
   PHYSICS_SCENE_BACKGROUND_COLOR,
@@ -35,6 +36,7 @@ export function Environment(): React.JSX.Element {
       {showSky ? (
         <SkyModel
           fallbackColor={GAME_SCENE_FALLBACK_BACKGROUND_COLOR}
+          fallbackModelPath={GAME_SCENE_SKY_FALLBACK_MODEL_PATH}
           modelPath={GAME_SCENE_SKY_MODEL_PATH}
           scale={GAME_SCENE_SKY_MODEL_SCALE}
         />

src/world/World.tsx

@@ -90,7 +90,7 @@ export function World({ onLoadingStateChange }: WorldProps): React.JSX.Element {
             onLoadingStateChange={onLoadingStateChange}
             onOctreeReady={handleOctreeReady}
           />
-          <PersonnageSystem />
+          {showGameStage ? <PersonnageSystem /> : null}
           {showGameStage ? (
             <Physics>
               <GameStageLoaded onLoaded={handleGameStageLoaded} />

src/world/vegetation/InstancedVegetation.tsx

@@ -194,17 +194,18 @@ function createInstanceMatrices(
   const position = new THREE.Vector3();
   const rotation = new THREE.Euler();
   const quaternion = new THREE.Quaternion();
-  const scale = new THREE.Vector3(
-    scaleMultiplier,
-    scaleMultiplier,
-    scaleMultiplier,
-  );
+  const scale = new THREE.Vector3();
 
   for (const instance of instances) {
     const matrix = new THREE.Matrix4();
 
     position.set(...instance.position);
-    position.y += -geometryBottomY * scaleMultiplier;
+    scale.set(
+      instance.scale[0] * scaleMultiplier,
+      instance.scale[1] * scaleMultiplier,
+      instance.scale[2] * scaleMultiplier,
+    );
+    position.y += -geometryBottomY * scale.y;
     rotation.set(
       instance.rotation[0] + rotationOffset[0],
       instance.rotation[1] + rotationOffset[1],