diff --git a/src/document/scene-document-validation.ts b/src/document/scene-document-validation.ts
index 14b5a06a..835a9470 100644
--- a/src/document/scene-document-validation.ts
+++ b/src/document/scene-document-validation.ts
@@ -3059,7 +3059,10 @@ function validateTerrain(
   const expectedPaintWeightCount =
     terrain.sampleCountX *
     terrain.sampleCountZ *
-    getTerrainStoredPaintWeightCount(terrain.layers.length);
+    (terrain.layers.length >= MIN_TERRAIN_LAYER_COUNT &&
+    terrain.layers.length <= MAX_TERRAIN_LAYER_COUNT
+      ? getTerrainStoredPaintWeightCount(terrain.layers.length)
+      : 0);
 
   if (terrain.paintWeights.length !== expectedPaintWeightCount) {
     diagnostics.push(
diff --git a/src/document/scene-document.ts b/src/document/scene-document.ts
index 1149cebf..f1b4bbb4 100644
--- a/src/document/scene-document.ts
+++ b/src/document/scene-document.ts
@@ -35,7 +35,8 @@ import {
   type FoliagePrototypeRegistry
 } from "../foliage/foliage";
 
-export const SCENE_DOCUMENT_VERSION = 102 as const;
+export const SCENE_DOCUMENT_VERSION = 103 as const;
+export const DYNAMIC_TERRAIN_LAYERS_SCENE_DOCUMENT_VERSION = 103 as const;
 export const PATH_ROAD_PREVIEW_SCENE_DOCUMENT_VERSION = 102 as const;
 export const PATH_TERRAIN_GLUE_SCENE_DOCUMENT_VERSION = 101 as const;
 export const SPLINE_PATH_SCENE_DOCUMENT_VERSION = 100 as const;