diff --git a/server-rs/crates/api-server/src/editor_project.rs b/server-rs/crates/api-server/src/editor_project.rs
index 285d0885e..5b1f14613 100644
--- a/server-rs/crates/api-server/src/editor_project.rs
+++ b/server-rs/crates/api-server/src/editor_project.rs
@@ -8827,7 +8827,7 @@ fn sanitize_editor_payload_media(
         })
         .collect();
     strip_legacy_canvas_layer_media_type(&mut value);
-    sanitize_editor_payload_media_value(&mut value, None, &resource_media);
+    let _ = sanitize_editor_payload_media_value(&mut value, None, &resource_media);
     value
 }
 
@@ -8850,15 +8850,22 @@ fn strip_legacy_canvas_layer_media_type(value: &mut Value) {
 }
 
 fn sanitize_editor_payload_inline_media(mut value: Value) -> Value {
-    sanitize_editor_payload_media_value(&mut value, None, &BTreeMap::new());
+    let _ = sanitize_editor_payload_media_value(&mut value, None, &BTreeMap::new());
     value
 }
 
+/// 返回 `true` 表示这个值本身就是被抹掉的内联媒体，调用方必须把承载它的键或数组元素一并删除。
+///
+/// 中文注释：删除范围必须严格限定在「本次抹掉的值」。早期实现在每层对象上无差别执行
+/// `retain(|_, child| !child.is_null())`，把调用方原本就写着 `null` 的合法契约字段一起删了：
+/// SFX 自动时长的 `generationInputs.soundEffect.requestedDurationSeconds` 正是这样在读边界
+/// 消失，客户端据此判定整份 soundEffect 元数据非法，音频信息页整块退化成空。脱敏强度不变
+/// ——内联媒体仍然先被置空再连键删除，只是不再殃及本来就是 `null` 的字段。
 fn sanitize_editor_payload_media_value(
     value: &mut Value,
     inherited_media: Option<&EditorPayloadMediaReference>,
     resource_media: &BTreeMap<String, EditorPayloadMediaReference>,
-) {
+) -> bool {
     match value {
         Value::Object(object) => {
             let current_media = object
@@ -8913,21 +8920,32 @@ fn sanitize_editor_payload_media_value(
                     *generation_inputs = sanitized;
                 }
             }
-            for child in object.values_mut() {
-                sanitize_editor_payload_media_value(child, current_media.as_ref(), resource_media);
+            let mut sanitized_keys = Vec::new();
+            for (key, child) in object.iter_mut() {
+                if sanitize_editor_payload_media_value(
+                    child,
+                    current_media.as_ref(),
+                    resource_media,
+                ) {
+                    sanitized_keys.push(key.clone());
+                }
             }
-            object.retain(|_, child| !child.is_null());
+            for key in &sanitized_keys {
+                object.remove(key);
+            }
+            false
         }
         Value::Array(items) => {
-            for item in items.iter_mut() {
-                sanitize_editor_payload_media_value(item, inherited_media, resource_media);
-            }
-            items.retain(|item| !item.is_null());
+            items.retain_mut(|item| {
+                !sanitize_editor_payload_media_value(item, inherited_media, resource_media)
+            });
+            false
         }
         Value::String(item) if is_forbidden_editor_persisted_media_src(item) => {
             *value = Value::Null;
+            true
         }
-        _ => {}
+        _ => false,
     }
 }
 
@@ -13913,6 +13931,66 @@ mod tests {
         assert!(frames_only.image_sequence_duration_ms.is_none());
     }
 
+    #[test]
+    fn editor_user_generation_inputs_keep_sound_effect_auto_duration_null() {
+        let sanitized = sanitize_editor_user_generation_inputs(json!({
+            "fields": [
+                { "title": "用户描述", "value": "金币落地" },
+                { "title": "时长", "value": "7.42秒" }
+            ],
+            "references": [],
+            "soundEffect": {
+                "schemaVersion": 2,
+                "userPrompt": "金币落地",
+                "actualPrompt": "A bright coin landing chime",
+                "model": "eleven_text_to_sound_v2",
+                "durationMode": "auto",
+                "requestedDurationSeconds": null,
+                "actualDurationSeconds": 7.42,
+                "loop": false
+            }
+        }));
+
+        // 自动时长的 requestedDurationSeconds 是「没有请求时长」的合法契约值。读边界脱敏不得
+        // 把它连键删掉，否则客户端判定整份 SFX 元数据非法，音频信息页会连 fields 一起空掉。
+        let sound_effect = sanitized
+            .get("soundEffect")
+            .and_then(Value::as_object)
+            .expect("soundEffect 必须完整穿过读边界脱敏");
+        assert!(sound_effect.contains_key("requestedDurationSeconds"));
+        assert_eq!(sound_effect["requestedDurationSeconds"], Value::Null);
+        assert_eq!(sound_effect["durationMode"], json!("auto"));
+        assert_eq!(sound_effect["actualDurationSeconds"], json!(7.42));
+        assert_eq!(sanitized["fields"][0]["value"], json!("金币落地"));
+    }
+
+    #[test]
+    fn editor_user_generation_inputs_still_drop_inline_media_and_reserved_fields() {
+        let sanitized = sanitize_editor_user_generation_inputs(json!({
+            "fields": [{ "title": "参考图", "value": "data:image/png;base64,forged" }],
+            "references": [
+                {
+                    "title": "参考图",
+                    "refId": "asset-1",
+                    "src": "data:image/png;base64,forged"
+                }
+            ],
+            "screenColorHex": "#00ff00",
+            "mattingProvider": "internal-provider",
+            "mattingModel": "internal-model"
+        }));
+
+        // 脱敏强度不变：内联媒体仍然连键消失，保留字段仍然被摘掉。
+        let payload = serde_json::to_string(&sanitized).expect("payload serializes");
+        assert!(!payload.contains("data:image"));
+        assert!(sanitized["fields"][0].get("value").is_none());
+        assert!(sanitized["references"][0].get("src").is_none());
+        assert_eq!(sanitized["references"][0]["refId"], json!("asset-1"));
+        for reserved in ["screenColorHex", "mattingProvider", "mattingModel"] {
+            assert!(sanitized.get(reserved).is_none());
+        }
+    }
+
     #[test]
     fn editor_payload_media_sanitizer_replaces_inline_layer_src_from_resource() {
         let resources = vec![EditorProjectResourcePayload {
diff --git a/src/components/image-editor/ImageCanvasEditorModel.test.ts b/src/components/image-editor/ImageCanvasEditorModel.test.ts
index 2c2845b7c..978138cba 100644
--- a/src/components/image-editor/ImageCanvasEditorModel.test.ts
+++ b/src/components/image-editor/ImageCanvasEditorModel.test.ts
@@ -1217,6 +1217,35 @@ describe('ImageCanvasEditorModel', () => {
       generationInputsOrNull({ fields: [], references: [], soundEffect }),
     ).toEqual({ fields: [], references: [], soundEffect });
 
+    // 中文注释：自动时长的 requestedDurationSeconds 是「没有请求时长」，显式 null 与整个键
+    // 缺失同义。服务端读边界的内联媒体脱敏曾把这个 null 连键删掉，只认 null 会让整份元数据
+    // 被判非法，音频信息页连 fields 一起空掉。
+    const autoSoundEffect = {
+      ...soundEffect,
+      durationMode: 'auto' as const,
+      requestedDurationSeconds: null,
+    };
+    const autoSoundEffectWithoutRequestedDuration: Record<string, unknown> = {
+      ...autoSoundEffect,
+    };
+    delete autoSoundEffectWithoutRequestedDuration.requestedDurationSeconds;
+    for (const validAutoSoundEffect of [
+      autoSoundEffect,
+      autoSoundEffectWithoutRequestedDuration,
+    ]) {
+      expect(
+        generationInputsOrNull({
+          fields: [{ title: '用户描述', value: '金币落地' }],
+          references: [],
+          soundEffect: validAutoSoundEffect,
+        }),
+      ).toEqual({
+        fields: [{ title: '用户描述', value: '金币落地' }],
+        references: [],
+        soundEffect: autoSoundEffect,
+      });
+    }
+
     for (const invalidSoundEffect of [
       { ...soundEffect, schemaVersion: 1 },
       { ...soundEffect, model: 'audio1.0' },
diff --git a/src/components/image-editor/ImageCanvasGenerationInputsModel.ts b/src/components/image-editor/ImageCanvasGenerationInputsModel.ts
index 0684ece44..463308b1e 100644
--- a/src/components/image-editor/ImageCanvasGenerationInputsModel.ts
+++ b/src/components/image-editor/ImageCanvasGenerationInputsModel.ts
@@ -135,7 +135,13 @@ function soundEffectGenerationMetadataOrNull(
   }
   let requestedDurationSeconds: number | null;
   if (value.durationMode === 'auto') {
-    if (value.requestedDurationSeconds !== null) {
+    // 中文注释：自动时长的契约值是「没有请求时长」，显式 null 与整个键缺失同义，两种形态都要
+    // 接受。服务端读边界的内联媒体脱敏曾把这个 null 连键删掉，只认 null 会让整份 soundEffect
+    // 元数据被判非法，音频信息页连带 fields 一起退化成空。
+    if (
+      value.requestedDurationSeconds !== null &&
+      value.requestedDurationSeconds !== undefined
+    ) {
       return null;
     }
     requestedDurationSeconds = null;
diff --git a/src/components/image-editor/ImageCanvasMetadataModalView.test.tsx b/src/components/image-editor/ImageCanvasMetadataModalView.test.tsx
index b4036ca15..cd1aaf265 100644
--- a/src/components/image-editor/ImageCanvasMetadataModalView.test.tsx
+++ b/src/components/image-editor/ImageCanvasMetadataModalView.test.tsx
@@ -352,6 +352,34 @@ describe('ImageCanvasMetadataModalView', () => {
     }
   });
 
+  it('keeps the full sound effect task id when SFX metadata is unavailable', () => {
+    render(
+      <ImageCanvasMetadataModalView
+        layer={createLayer({
+          title: '金币音效',
+          src: '/generated-character-drafts/editor-audios/coin.mp3',
+          mediaType: 'audio',
+          assetKind: 'sound-effect',
+          originalWidth: 420,
+          originalHeight: 120,
+          model: 'eleven_text_to_sound_v2',
+          taskId: 'task-sfx-v2-1234-abcd',
+          generationInputs: {
+            fields: [{ title: '用户描述', value: '金币落地' }],
+            references: [],
+          },
+        })}
+        onClose={vi.fn()}
+      />,
+    );
+
+    // 中文注释：音效 taskId 是 operation id 形态，「取最后一段数字」会截出 1234 这种误导值。
+    // Task 这一栏不能因为 soundEffect 元数据缺失就降级成假值。
+    const dialog = screen.getByRole('dialog', { name: '音频信息' });
+    expect(within(dialog).getByText('task-sfx-v2-1234-abcd')).toBeTruthy();
+    expect(within(dialog).queryByText('1234')).toBeNull();
+  });
+
   it('does not render a dialog when no layer is selected', () => {
     render(<ImageCanvasMetadataModalView layer={null} onClose={vi.fn()} />);
 
diff --git a/src/components/image-editor/ImageCanvasMetadataModalView.tsx b/src/components/image-editor/ImageCanvasMetadataModalView.tsx
index 134f2bc40..7a9237bd9 100644
--- a/src/components/image-editor/ImageCanvasMetadataModalView.tsx
+++ b/src/components/image-editor/ImageCanvasMetadataModalView.tsx
@@ -105,7 +105,12 @@ export function ImageCanvasMetadataModalView({
           ) : null}
           <dt>Task</dt>
           <dd>
-            {layer.generationInputs?.soundEffect?.schemaVersion === 2
+            {/* 中文注释：音效的 taskId 是 operation id 形态，`formatTaskIdForDisplay` 的
+                「取最后一段数字」会把它截成 `0` 这类误导值。判据取图层自身的 assetKind，
+                不再依赖 soundEffect 元数据是否解析成功——元数据一旦缺失，Task 这一栏不该
+                跟着降级成假值。 */}
+            {layer.assetKind === 'sound-effect' ||
+            layer.generationInputs?.soundEffect?.schemaVersion === 2
               ? layer.taskId || '-'
               : formatTaskIdForDisplay(layer.taskId)}
           </dd>