From 4fcdf4871f75f2682c005a1d5429e027f342190c Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Tue, 31 Mar 2026 02:40:21 +0200
Subject: [PATCH] Update migrateSceneDocument to handle materials and brushes

---
 src/document/migrate-scene-document.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/document/migrate-scene-document.ts b/src/document/migrate-scene-document.ts
index da275bc1..3b88270d 100644
--- a/src/document/migrate-scene-document.ts
+++ b/src/document/migrate-scene-document.ts
@@ -327,6 +327,9 @@ export function migrateSceneDocument(source: unknown): SceneDocument {
   }
 
   if (source.version === FOUNDATION_SCENE_DOCUMENT_VERSION) {
+    expectEmptyCollection(source.materials, "materials");
+    expectEmptyCollection(source.brushes, "brushes");
+
     return {
       version: SCENE_DOCUMENT_VERSION,
       name: expectString(source.name, "name"),
@@ -342,6 +345,7 @@ export function migrateSceneDocument(source: unknown): SceneDocument {
   }
 
   if (source.version === BOX_BRUSH_SCENE_DOCUMENT_VERSION) {
+    expectEmptyCollection(source.materials, "materials");
     const materials = createStarterMaterialRegistry();
 
     return {