diff --git a/server-rs/crates/api-server/src/editor_project.rs b/server-rs/crates/api-server/src/editor_project.rs
index 285d0885e..4b98fa4e6 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 +8850,23 @@ 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：放宽只针对**对象字段**。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。对象字段的 `null`
+/// 是「有意义的空值」，必须原样下发；**数组元素的 `null` 是无效元素，照旧过滤**（见 Array 分支）。
+/// 脱敏强度不变——内联媒体仍然先被置空再连键/连元素删除。
 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 +8921,40 @@ 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());
+            // 中文注释：数组元素继续沿用「连 null 一起丢掉」的旧行为，放宽只发生在对象字段上。
+            // 布局数组是唯一没有元素级 shape 校验的写入口（legacy layout_storage_version=0 是
+            // 新画布的默认状态），一个 null 元素读回前端后会让 canvasLayoutItemId /
+            // isCanvasSettingsLayoutItem 抛 TypeError，整次项目套用静默失败；generationInputs
+            // 的 fields / references 里混进 null 元素也会让整份元数据被判非法丢弃。两者都是
+            // 「无效元素」而不是「有意义的空值」，读边界照旧过滤掉。
+            items.retain_mut(|item| {
+                let sanitized =
+                    sanitize_editor_payload_media_value(item, inherited_media, resource_media);
+                !sanitized && !item.is_null()
+            });
+            false
         }
         Value::String(item) if is_forbidden_editor_persisted_media_src(item) => {
             *value = Value::Null;
+            true
         }
-        _ => {}
+        _ => false,
     }
 }
 
@@ -13913,6 +13940,118 @@ 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_sanitizer_drops_null_array_items_but_keeps_null_object_fields() {
+        // 数组元素的 null 是无效元素：布局数组里留下一个就会让前端 canvasLayoutItemId /
+        // isCanvasSettingsLayoutItem 抛 TypeError，generationInputs 的 fields 里留下一个会让
+        // 整份元数据被判非法。对象字段的 null 是有意义的空值，必须原样下发。
+        let sanitized = sanitize_editor_payload_media(
+            json!([
+                null,
+                {
+                    "layerId": "layer-1",
+                    "resourceId": "resource-1",
+                    "sourceResourceId": null,
+                    "generationInputs": {
+                        "fields": [null, { "title": "用户描述", "value": "金币落地" }],
+                        "references": [],
+                        "soundEffect": {
+                            "schemaVersion": 2,
+                            "durationMode": "auto",
+                            "requestedDurationSeconds": null
+                        }
+                    }
+                },
+                null
+            ]),
+            &[],
+        );
+
+        let items = sanitized.as_array().expect("顶层仍是数组");
+        assert_eq!(items.len(), 1, "布局数组里的 null 元素必须被过滤掉");
+        let layer = &items[0];
+        assert_eq!(layer["layerId"], json!("layer-1"));
+
+        let fields = layer["generationInputs"]["fields"]
+            .as_array()
+            .expect("fields 仍是数组");
+        assert_eq!(fields.len(), 1, "fields 里的 null 元素必须被过滤掉");
+        assert_eq!(fields[0]["title"], json!("用户描述"));
+
+        let sound_effect = layer["generationInputs"]["soundEffect"]
+            .as_object()
+            .expect("soundEffect 保留");
+        assert!(sound_effect.contains_key("requestedDurationSeconds"));
+        assert_eq!(sound_effect["requestedDurationSeconds"], Value::Null);
+        assert!(
+            layer
+                .as_object()
+                .expect("图层是对象")
+                .contains_key("sourceResourceId"),
+            "对象字段的 null 要原样保留"
+        );
+    }
+
     #[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..c108b87d8 100644
--- a/src/components/image-editor/ImageCanvasMetadataModalView.test.tsx
+++ b/src/components/image-editor/ImageCanvasMetadataModalView.test.tsx
@@ -352,6 +352,125 @@ 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('keeps the task id display tied to the generating model across asset tag overrides', () => {
+    // 中文注释：展示口径由「谁生成了这个 taskId」决定，也就是 model。素材标签只改
+    // assetKindOverride，不该影响它：背景音乐被改标成「音效」不能换用完整 id，音效被改标成
+    // 「背景音乐」更不能退回截断假值。
+    const { unmount } = render(
+      <ImageCanvasMetadataModalView
+        layer={createLayer({
+          title: '游戏背景音乐',
+          src: '/generated-character-drafts/editor-audios/music.wav',
+          mediaType: 'audio',
+          resourceAssetKind: 'background-music',
+          assetKindOverride: 'sound-effect',
+          assetKind: 'sound-effect',
+          originalWidth: 420,
+          originalHeight: 120,
+          model: 'suno',
+          taskId: 'audio-task-75',
+          generationInputs: {
+            fields: [{ title: '音乐描述', value: '紧张的地下城循环音乐' }],
+            references: [],
+          },
+        })}
+        onClose={vi.fn()}
+      />,
+    );
+
+    const musicDialog = screen.getByRole('dialog', { name: '音频信息' });
+    expect(within(musicDialog).getByText('75')).toBeTruthy();
+    expect(within(musicDialog).queryByText('audio-task-75')).toBeNull();
+    unmount();
+
+    render(
+      <ImageCanvasMetadataModalView
+        layer={createLayer({
+          title: '金币音效',
+          src: '/generated-character-drafts/editor-audios/coin.mp3',
+          mediaType: 'audio',
+          resourceAssetKind: 'sound-effect',
+          assetKindOverride: 'background-music',
+          assetKind: 'background-music',
+          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()}
+      />,
+    );
+
+    const soundEffectDialog = screen.getByRole('dialog', { name: '音频信息' });
+    expect(
+      within(soundEffectDialog).getByText('task-sfx-v2-1234-abcd'),
+    ).toBeTruthy();
+    expect(within(soundEffectDialog).queryByText('1234')).toBeNull();
+  });
+
+  it('keeps the full sound effect task id when the resource kind is unresolvable', () => {
+    // 中文注释：legacy 布局快照没有 assetKindOverride 键，水合时旧的 assetKind 会被当成
+    // override；资源行又缺 assetKind（或整个 resource 查不到）时 resourceAssetKind 是 null。
+    // 这正是元数据缺失最常伴随的形态，判据不能依赖资源分类，否则又退回截断假值。
+    render(
+      <ImageCanvasMetadataModalView
+        layer={createLayer({
+          title: '金币音效',
+          src: '/generated-character-drafts/editor-audios/coin.mp3',
+          mediaType: 'audio',
+          resourceAssetKind: null,
+          assetKindOverride: 'sound-effect',
+          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()}
+      />,
+    );
+
+    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..6d9a25e89 100644
--- a/src/components/image-editor/ImageCanvasMetadataModalView.tsx
+++ b/src/components/image-editor/ImageCanvasMetadataModalView.tsx
@@ -1,3 +1,4 @@
+import { EDITOR_SOUND_EFFECT_MODEL } from '../../../packages/shared/src/contracts/editorAudio';
 import { UnifiedModal } from '../common/UnifiedModal';
 import type { CanvasLayer } from './ImageCanvasEditorTypes';
 import { formatTaskIdForDisplay } from './ImageCanvasExportModel';
@@ -105,7 +106,19 @@ 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`、`1234` 这类误导值。判据要回答的是「这个
+                taskId 由谁生成」，而不是「这个图层被归成哪一类」，所以落在 model 上：它是
+                资源行权威字段（registered 图层的 serializeLayer 不回写它），改「素材标签」
+                不影响它，水合时 resolveHydratedLayerModel 也优先取资源行的值；后端
+                canonicalize_editor_sound_effect_model 只接受 eleven_text_to_sound_v2 一个取值。
+                用 assetKind / resourceAssetKind 判都踩过坑：前者是 assetKindOverride ??
+                resourceAssetKind，用户改一次标签就翻转；后者在 legacy 布局（快照没有
+                assetKindOverride 键，旧 assetKind 被当成 override）和资源行查不到时都是 null。
+                soundEffect 那一支只是补充——它和生成 action 一样长在 generationInputs 上，
+                元数据整块缺失时会一并消失，而那正是这里要兜住的场景。 */}
+            {layer.model === EDITOR_SOUND_EFFECT_MODEL ||
+            layer.generationInputs?.soundEffect?.schemaVersion === 2
               ? layer.taskId || '-'
               : formatTaskIdForDisplay(layer.taskId)}
           </dd>