auto-git:

[change] src/document/migrate-scene-document.ts

src/document/migrate-scene-document.ts

@@ -2508,6 +2508,7 @@ function readWorldBackgroundSettings(
   label: string,
   options: {
     allowMissing?: boolean;
+    allowShader?: boolean;
     defaultValue?: WorldBackgroundSettings;
   } = {}
 ): WorldBackgroundSettings {
@@ -2529,6 +2530,10 @@ function readWorldBackgroundSettings(
     throw new Error(`${label}.mode must be a supported background mode.`);
   }
 
+  if (backgroundMode === "shader" && options.allowShader === false) {
+    throw new Error(`${label}.mode must not use a shader background here.`);
+  }
+
   if (backgroundMode === "solid") {
     return {
       mode: "solid",
@@ -2729,6 +2734,7 @@ function readWorldTimePhaseProfile(
   return {
     background: readWorldBackgroundSettings(value.background, `${label}.background`, {
       allowMissing: true,
+      allowShader: false,
       defaultValue: fallbackBackground
     }),
     skyTopColorHex,
@@ -2852,6 +2858,7 @@ function readWorldTimeOfDaySettings(
         `${label}.night.background`,
         {
           allowMissing: true,
+          allowShader: false,
           defaultValue: nightDefaults.background
         }
       ),