diff --git a/apps/ai-game-creator-shell/src/view/ui-editor/components/Inspector/Components/ImageAssetSelector.tsx b/apps/ai-game-creator-shell/src/view/ui-editor/components/Inspector/Components/ImageAssetSelector.tsx
index 6ec0e1517..42c15c56f 100644
--- a/apps/ai-game-creator-shell/src/view/ui-editor/components/Inspector/Components/ImageAssetSelector.tsx
+++ b/apps/ai-game-creator-shell/src/view/ui-editor/components/Inspector/Components/ImageAssetSelector.tsx
@@ -18,9 +18,9 @@ export function ImageAssetSelector({
   onChange: (value: string | null) => void;
 }) {
   const [open, setOpen] = useState(false);
-  const [failedPreviewIds, setFailedPreviewIds] = useState<Set<string>>(
-    () => new Set(),
-  );
+  const [failedPreviewUrls, setFailedPreviewUrls] = useState<
+    Record<string, string>
+  >({});
   const selectedSprite = value ? sprites[value] : undefined;
   const selectedLabel = selectedSprite
     ? selectedSprite.metadata.name || value || '未绑定'
@@ -38,12 +38,10 @@ export function ImageAssetSelector({
     close();
   }
 
-  function markPreviewFailed(id: string) {
-    setFailedPreviewIds((current) => {
-      if (current.has(id)) return current;
-      const next = new Set(current);
-      next.add(id);
-      return next;
+  function markPreviewFailed(id: string, url: string) {
+    setFailedPreviewUrls((current) => {
+      if (current[id] === url) return current;
+      return { ...current, [id]: url };
     });
   }
 
@@ -111,7 +109,7 @@ export function ImageAssetSelector({
             {Object.entries(sprites).map(([id, sprite]) => {
               const previewUrl = previewUrls[id];
               const hasPreview =
-                Boolean(previewUrl) && !failedPreviewIds.has(id);
+                Boolean(previewUrl) && failedPreviewUrls[id] !== previewUrl;
               const selected = value === id;
               return (
                 <button
@@ -127,7 +125,7 @@ export function ImageAssetSelector({
                         src={previewUrl}
                         alt={sprite.metadata.name || id}
                         className="size-full object-contain"
-                        onError={() => markPreviewFailed(id)}
+                        onError={() => markPreviewFailed(id, previewUrl)}
                       />
                     ) : (
                       <ImageIcon
diff --git a/apps/ai-game-creator-shell/tests/imageAssetSelector.test.tsx b/apps/ai-game-creator-shell/tests/imageAssetSelector.test.tsx
index f87eb0342..02b9627c1 100644
--- a/apps/ai-game-creator-shell/tests/imageAssetSelector.test.tsx
+++ b/apps/ai-game-creator-shell/tests/imageAssetSelector.test.tsx
@@ -1,5 +1,11 @@
 /** @vitest-environment jsdom */
-import { cleanup, render, screen, within } from '@testing-library/react';
+import {
+  cleanup,
+  fireEvent,
+  render,
+  screen,
+  within,
+} from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 
@@ -90,6 +96,35 @@ describe('ImageAssetSelector', () => {
     );
   });
 
+  it('retries a preview when its URL is regenerated', async () => {
+    const user = userEvent.setup();
+    const view = renderSelector(null, vi.fn(), {
+      hero: 'data:image/png;base64,first',
+    });
+
+    await user.click(screen.getByRole('button', { name: '选择素材' }));
+    const dialog = screen.getByRole('dialog', { name: '选择图片素材' });
+    const image = within(dialog).getByAltText('主角');
+    fireEvent.error(image);
+    expect(within(dialog).queryByAltText('主角')).toBeNull();
+
+    view.rerender(
+      <ImageAssetSelector
+        value={null}
+        sprites={sprites}
+        previewUrls={{ hero: 'data:image/png;base64,regenerated' }}
+        readOnly={false}
+        onChange={vi.fn()}
+      />,
+    );
+
+    expect(
+      within(screen.getByRole('dialog', { name: '选择图片素材' })).getByAltText(
+        '主角',
+      ),
+    ).toBeTruthy();
+  });
+
   it('supports keyboard activation for sprite cards', async () => {
     const user = userEvent.setup();
     const onChange = vi.fn();
diff --git a/docs/technical/【前端架构】UI编辑会话模块边界-2026-08-19.md b/docs/technical/【前端架构】UI编辑会话模块边界-2026-08-19.md
index 6e33010bd..12460d0e0 100644
--- a/docs/technical/【前端架构】UI编辑会话模块边界-2026-08-19.md
+++ b/docs/technical/【前端架构】UI编辑会话模块边界-2026-08-19.md
@@ -15,6 +15,8 @@
 
 预览树在会话边界归一化为 `UITree | null`：尚未选择界面图、正在加载或尚未识别树时均以 `null` 表示，不能把 `Array.find` 的 `undefined` 传播到视图接口。
 
+素材缩略图的加载失败状态按“素材 ID + 预览 URL”记录；同一 URL 失败后显示占位图，资源重新加载或重新导入产生新 URL 时必须允许再次尝试，不能把失败永久绑定到素材 ID。
+
 保存与代码生成共享同一份持久化 State/revision。会话层在保存或生成进行期间互斥拦截，且代码生成必须基于已加载的持久化 revision；视图层的保存按钮和“保存并返回”按钮同步遵守该互斥状态。
 
 `UiDesignStateStore` 的 `generateCode(assetId)` 是必需能力，返回成功结果时不得为 nullable；所有注入的 adapter 与测试替身都必须实现该方法。