diff --git a/src/components/image-editor/model3d-preview/Model3dViewerModel.ts b/src/components/image-editor/model3d-preview/Model3dViewerModel.ts
index 600cb5e75..e4f9516eb 100644
--- a/src/components/image-editor/model3d-preview/Model3dViewerModel.ts
+++ b/src/components/image-editor/model3d-preview/Model3dViewerModel.ts
@@ -51,20 +51,21 @@ export function resolveModel3dViewerFailureText(
   detail: Model3dViewerStatusDetail | null | undefined,
   fallbackText: string,
 ) {
-  switch (detail?.reason) {
+  const reason = detail?.reason;
+  // 加载失败没有更细的可读信息，与原因缺失共用调用方的兜底文案。
+  if (reason === undefined || reason === 'load-failed') {
+    return fallbackText;
+  }
+  switch (reason) {
     case 'too-large':
       return `模型超过 ${MODEL3D_VIEWER_MAX_MIB} MiB，无法预览。`;
     case 'unsupported-format':
       return `无法识别模型格式，只支持 ${MODEL3D_VIEWER_SUPPORTED_FORMAT_TEXT}。`;
     case 'webgl-unavailable':
       return '当前环境不支持 WebGL2，无法预览模型。';
-    // 加载失败没有更细的可读信息，与原因缺失共用调用方的兜底文案。
-    case 'load-failed':
-    case undefined:
-      return fallbackText;
     default: {
       // 查看器新增失败原因时这里会编译报错，不会静默退化成通用文案。
-      const unhandledReason: never = detail?.reason;
+      const unhandledReason: never = reason;
       return unhandledReason;
     }
   }