diff --git a/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.test.tsx b/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.test.tsx
index 9ce92fd4f..e5853d598 100644
--- a/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.test.tsx
+++ b/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.test.tsx
@@ -2976,6 +2976,41 @@ describe('useImageCanvasGenerationSubmissionWorkflow', () => {
     expect(generateEditorCharacterAnimationMock).not.toHaveBeenCalled();
   });
 
+  it('reports stale character animation source validation failures', async () => {
+    render(
+      <SubmissionWorkflowHarness
+        initialLayers={[
+          createLayer({
+            id: 'character-layer',
+            assetKind: 'character-animation',
+            mediaType: 'image-sequence',
+            imageSequenceFrames: [],
+          }),
+        ]}
+        initialCharacterAnimationPanel={{
+          sourceLayerId: 'character-layer',
+          promptText: '  跑步  ',
+          resolution: '480p',
+          ratio: 'same',
+          frameCount: 32,
+          durationSeconds: 4,
+          status: 'idle',
+        }}
+      />,
+    );
+
+    await act(async () => {
+      fireEvent.click(screen.getByRole('button', { name: '提交角色动画' }));
+    });
+
+    await waitFor(() => {
+      expect(screen.getByTestId('character-animation').textContent).toBe(
+        'character-layer:failed:跑步:角色动作缺少正式序列首帧，无法继续生成。:-',
+      );
+    });
+    expect(generateEditorCharacterAnimationMock).not.toHaveBeenCalled();
+  });
+
   it('creates an action layer for dialog-driven character animation submissions', async () => {
     generateEditorCharacterAnimationMock.mockResolvedValueOnce({
       taskId: 'animation-task-dialog',
diff --git a/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts b/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts
index adf9b5253..2862f76bd 100644
--- a/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts
+++ b/src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts
@@ -2166,40 +2166,39 @@ export function useImageCanvasGenerationSubmissionWorkflow({
     ) {
       return;
     }
-    const submissionPlan = buildCharacterAnimationSubmissionPlan({
-      panel: characterAnimationPanel,
-      sourceLayer: characterAnimationSourceLayer,
-    });
     const canvasDialog = characterAnimationDialog;
-    if (canvasDialog?.mode === 'character-animation') {
-      updateCanvasGenerationDialogById(canvasDialog.id, (currentDialog) => ({
-        ...currentDialog,
-        prompt: submissionPlan.promptText,
-        characterAnimationResolution: characterAnimationPanel.resolution,
-        characterAnimationRatio: characterAnimationPanel.ratio,
-        characterAnimationFrameCount: characterAnimationPanel.frameCount,
-        characterAnimationDurationSeconds:
-          characterAnimationPanel.durationSeconds,
-        assetLabel: submissionPlan.resultTitle,
-        characterAnimationResult: undefined,
-        status: 'generating',
-        composerOpen: false,
-        errorMessage: undefined,
-      }));
-    }
-    const nextPanel = {
-      ...characterAnimationPanel,
-      promptText: submissionPlan.promptText,
-      assetLabel: submissionPlan.resultTitle,
-      status: 'generating' as const,
-      errorMessage: undefined,
-      result: undefined,
-    };
-    if (!canvasDialog) {
-      setCharacterAnimationPanel(nextPanel);
-    }
-
     try {
+      const submissionPlan = buildCharacterAnimationSubmissionPlan({
+        panel: characterAnimationPanel,
+        sourceLayer: characterAnimationSourceLayer,
+      });
+      if (canvasDialog?.mode === 'character-animation') {
+        updateCanvasGenerationDialogById(canvasDialog.id, (currentDialog) => ({
+          ...currentDialog,
+          prompt: submissionPlan.promptText,
+          characterAnimationResolution: characterAnimationPanel.resolution,
+          characterAnimationRatio: characterAnimationPanel.ratio,
+          characterAnimationFrameCount: characterAnimationPanel.frameCount,
+          characterAnimationDurationSeconds:
+            characterAnimationPanel.durationSeconds,
+          assetLabel: submissionPlan.resultTitle,
+          characterAnimationResult: undefined,
+          status: 'generating',
+          composerOpen: false,
+          errorMessage: undefined,
+        }));
+      }
+      const nextPanel = {
+        ...characterAnimationPanel,
+        promptText: submissionPlan.promptText,
+        assetLabel: submissionPlan.resultTitle,
+        status: 'generating' as const,
+        errorMessage: undefined,
+        result: undefined,
+      };
+      if (!canvasDialog) {
+        setCharacterAnimationPanel(nextPanel);
+      }
       const generationInputs = buildCharacterAnimationGenerationInputs(
         submissionPlan.promptText,
         characterAnimationSourceLayer,
@@ -2283,7 +2282,7 @@ export function useImageCanvasGenerationSubmissionWorkflow({
       if (canvasDialog) {
         updateCanvasGenerationDialogById(canvasDialog.id, (currentDialog) => ({
           ...currentDialog,
-          prompt: submissionPlan.promptText,
+          prompt: characterAnimationPanel.promptText.trim(),
           characterAnimationResolution: characterAnimationPanel.resolution,
           characterAnimationRatio: characterAnimationPanel.ratio,
           characterAnimationFrameCount: characterAnimationPanel.frameCount,
@@ -2302,6 +2301,7 @@ export function useImageCanvasGenerationSubmissionWorkflow({
         currentPanel
           ? {
               ...currentPanel,
+              promptText: characterAnimationPanel.promptText.trim(),
               status: 'failed',
               errorMessage: resolveImageGenerationErrorMessage(
                 error,