diff --git a/docs/agent/VRENDER_RUNTIME_AND_ENTRIES.md b/docs/agent/VRENDER_RUNTIME_AND_ENTRIES.md
index dc9e64902..cad2fd9f8 100644
--- a/docs/agent/VRENDER_RUNTIME_AND_ENTRIES.md
+++ b/docs/agent/VRENDER_RUNTIME_AND_ENTRIES.md
@@ -65,6 +65,17 @@ Stage 创建属于 app：
 - handle 的 `release()` 减少引用计数；最后一个 handle 释放后 app 释放。
 - 直接调用 shared app 的 `app.release()` 会走同一 record release 逻辑。
 
+### 跨 bundle 的内部 ID
+
+`vrender-core/src/common/generator.ts` 在同一 JavaScript realm 内通过
+`Symbol.for('@visactor/vrender-core/generator-state')` 共享数字 ID 计数器。
+多个 bundle 的节点可能经 shared app / runtime service 进入同一棵树，
+因此 ID 不能按模块副本或 app 独立计数，也不能随 app release 重置。
+模块初始化时缓存计数器对象，分配 ID 的热路径只做一次递增。
+
+旧版本的模块独立计数器不会自动接入此机制；发布时仍需覆盖共存的依赖版本。
+回归入口：core 的 `common/generator.test.ts` 和 `graphic/node-tree-cross-bundle.test.ts`。
+
 ## `shared` / `shared-browser` / `shared-lynx` / `shared-browser-lite`
 
 - `./entries/shared`：通用 env shared entry，支持 `browser`、`node`、`taro`、`feishu`、`tt`、`wx`、`lynx`、`harmony`。package exports 中 `browser` condition 路由到 `shared-browser.js`，`lynx` condition 路由到 `shared-lynx.js`。
diff --git a/packages/vrender-core/__tests__/unit/common/generator.test.ts b/packages/vrender-core/__tests__/unit/common/generator.test.ts
index c00bc5cc4..56b99b209 100644
--- a/packages/vrender-core/__tests__/unit/common/generator.test.ts
+++ b/packages/vrender-core/__tests__/unit/common/generator.test.ts
@@ -1,6 +1,16 @@
-import { Generator } from '../../../src/common/generator';
+import type { Generator as GeneratorClass } from '../../../src/common/generator';
+
+function loadGeneratorCopy(): typeof GeneratorClass {
+  let copy: typeof GeneratorClass;
+  jest.isolateModules(() => {
+    copy = jest.requireActual<{ Generator: typeof GeneratorClass }>('../../../src/common/generator').Generator;
+  });
+  return copy;
+}
 
 describe('Generator', () => {
+  const Generator = loadGeneratorCopy();
+
   test('GenAutoIncrementId returns a finite number', () => {
     const id = Generator.GenAutoIncrementId();
     expect(typeof id).toBe('number');
@@ -20,4 +30,35 @@ describe('Generator', () => {
       expect(ids[i + 1]).toBe(ids[i] + 1);
     }
   });
+
+  test('keeps IDs unique when independently loaded copies allocate alternately', () => {
+    const first = loadGeneratorCopy();
+    const second = loadGeneratorCopy();
+    expect(first).not.toBe(second);
+
+    const ids = Array.from({ length: 100 }, (_, index) => (index % 2 === 0 ? first : second).GenAutoIncrementId());
+
+    expect(new Set(ids).size).toBe(ids.length);
+    ids.slice(1).forEach((id, index) => expect(id).toBe(ids[index] + 1));
+  });
+
+  test('continues the sequence when another bundle loads after allocations', () => {
+    const first = loadGeneratorCopy();
+    const ids = Array.from({ length: 100 }, () => first.GenAutoIncrementId());
+    const second = loadGeneratorCopy();
+    const next = second.GenAutoIncrementId();
+
+    expect(next).toBe(ids[ids.length - 1] + 1);
+    expect(first.GenAutoIncrementId()).toBe(next + 1);
+  });
+
+  test('does not restart the sequence when a module is evaluated again', () => {
+    const first = loadGeneratorCopy();
+    const beforeReload = first.GenAutoIncrementId();
+    const reloaded = loadGeneratorCopy();
+
+    expect(reloaded).not.toBe(first);
+    expect(reloaded.GenAutoIncrementId()).toBe(beforeReload + 1);
+    expect(first.GenAutoIncrementId()).toBe(beforeReload + 2);
+  });
 });
diff --git a/packages/vrender-core/__tests__/unit/graphic/node-tree-cross-bundle.test.ts b/packages/vrender-core/__tests__/unit/graphic/node-tree-cross-bundle.test.ts
new file mode 100644
index 000000000..e164237ba
--- /dev/null
+++ b/packages/vrender-core/__tests__/unit/graphic/node-tree-cross-bundle.test.ts
@@ -0,0 +1,67 @@
+import type { Node } from '../../../src/graphic/node-tree';
+
+function loadNodeCopy(): typeof Node {
+  let copy: typeof Node;
+  jest.isolateModules(() => {
+    copy = jest.requireActual<{ Node: typeof Node }>('../../../src/graphic/node-tree').Node;
+  });
+  return copy;
+}
+
+describe('node trees across independently loaded bundles', () => {
+  test('attaches a child from another bundle instead of treating it as the parent itself', () => {
+    const FirstNode = loadNodeCopy();
+    const SecondNode = loadNodeCopy();
+    expect(FirstNode).not.toBe(SecondNode);
+
+    const parent = new FirstNode();
+    const child = new SecondNode();
+
+    expect(parent.appendChild(child)).toBe(child);
+    expect(parent.firstChild).toBe(child);
+    expect(parent.childrenCount).toBe(1);
+    expect(child.parent).toBe(parent);
+    expect(parent.appendChild(parent)).toBeNull();
+  });
+
+  test('preserves child lookup and removal when reparenting nodes from another bundle', () => {
+    const FirstNode = loadNodeCopy();
+    const SecondNode = loadNodeCopy();
+    const firstParent = new FirstNode();
+    const firstChild = new FirstNode();
+    const secondParent = new SecondNode();
+    const secondChild = new SecondNode();
+    firstParent.appendChild(firstChild);
+    secondParent.appendChild(secondChild);
+
+    firstParent.appendChild(secondChild);
+
+    expect(secondParent.childrenCount).toBe(0);
+    expect(firstParent.childrenCount).toBe(2);
+    expect(firstParent.findChildByUid(firstChild._uid)).toBe(firstChild);
+    expect(firstParent.findChildByUid(secondChild._uid)).toBe(secondChild);
+    expect(firstParent.removeChild(firstChild)).toBe(firstChild);
+    expect(firstChild.parent).toBeNull();
+    expect(firstParent.firstChild).toBe(secondChild);
+    expect(firstParent.findChildByUid(secondChild._uid)).toBe(secondChild);
+    expect(firstParent.removeChild(secondChild)).toBe(secondChild);
+    expect(firstParent.childrenCount).toBe(0);
+  });
+
+  test('distinguishes ancestry in separate trees created by different bundles', () => {
+    const FirstNode = loadNodeCopy();
+    const SecondNode = loadNodeCopy();
+    const firstParent = new FirstNode();
+    const firstChild = new FirstNode();
+    const secondParent = new SecondNode();
+    const secondChild = new SecondNode();
+    firstParent.appendChild(firstChild);
+    secondParent.appendChild(secondChild);
+
+    expect(firstChild.isChildOf(firstParent)).toBe(true);
+    expect(firstChild.isChildOf(secondParent)).toBe(false);
+    expect(firstChild.isDescendantsOf(secondParent)).toBe(false);
+    expect(firstParent.containNode(secondChild)).toBe(false);
+    expect(secondParent.containNode(firstChild)).toBe(false);
+  });
+});
diff --git a/packages/vrender-core/src/common/generator.ts b/packages/vrender-core/src/common/generator.ts
index 5a252a963..81e6897d1 100644
--- a/packages/vrender-core/src/common/generator.ts
+++ b/packages/vrender-core/src/common/generator.ts
@@ -1,7 +1,22 @@
-export class Generator {
-  private static auto_increment_id: number = 0;
+interface IGeneratorState {
+  autoIncrementId: number;
+}
 
+const GENERATOR_STATE_SYMBOL = Symbol.for('@visactor/vrender-core/generator-state');
+
+function getGeneratorState(): IGeneratorState {
+  const scope = globalThis as typeof globalThis & {
+    [GENERATOR_STATE_SYMBOL]?: IGeneratorState;
+  };
+  return scope[GENERATOR_STATE_SYMBOL] || (scope[GENERATOR_STATE_SYMBOL] = { autoIncrementId: 0 });
+}
+
+// Application and legacy runtime state are shared across bundles. Keep node ids in the same
+// global scope so a shared Stage cannot receive a Layer with a colliding id from another bundle.
+const generatorState = getGeneratorState();
+
+export class Generator {
   static GenAutoIncrementId(): number {
-    return Generator.auto_increment_id++;
+    return generatorState.autoIncrementId++;
   }
 }