diff --git a/example/tests/sandbox_test.js b/example/tests/sandbox_test.js
index da41b5be5..03ae01295 100644
--- a/example/tests/sandbox_test.js
+++ b/example/tests/sandbox_test.js
@@ -577,6 +577,15 @@
     );
   });
 
+  await test("TM半沙盒：把祖先类别继承直接写在半沙盒上 (Issue #1462 PR #1463)", async () => {
+    const trueWindow = unsafeWindow;
+    const sandboxWindow = window;
+    assertSame(false, Object.hasOwn(trueWindow, "addEventListener"), "unsafeWindow 继承 Object.hasOwn");
+    assertSame(true, Reflect.has(trueWindow, "addEventListener"), "unsafeWindow 继承 Reflect.has");
+    assertSame(true, Object.hasOwn(sandboxWindow, "addEventListener"), "window 属性 Object.hasOwn");
+    assertSame(true, Reflect.has(sandboxWindow, "addEventListener"), "window 属性 Reflect.has");
+  });
+
   section("GM API 注入与命名空间");
 
   await test("GM_info、GM.info 与 unsafeWindow 正确暴露", () => {
diff --git a/src/app/service/content/create_context.test.ts b/src/app/service/content/create_context.test.ts
index 8903b0e97..ca3deabdb 100644
--- a/src/app/service/content/create_context.test.ts
+++ b/src/app/service/content/create_context.test.ts
@@ -232,4 +232,9 @@ describe.concurrent("createProxyContext", () => {
     sandbox.onload = null;
     expect(removeEventListener).toHaveBeenCalledWith("load", eventObject);
   });
+
+  it.concurrent("TM半沙盒：把祖先类别继承直接写在半沙盒上 ( #1462 #1463 )", () => {
+    const sandbox = createProxyContext(createTestContext([]));
+    expect(Object.hasOwn(sandbox, "addEventListener")).toBe(true);
+  });
 });
diff --git a/src/app/service/content/create_context.ts b/src/app/service/content/create_context.ts
index 818d522f4..996f5a404 100644
--- a/src/app/service/content/create_context.ts
+++ b/src/app/service/content/create_context.ts
@@ -173,6 +173,9 @@ const overridedDescs: Record<string, PropertyDescriptor> = Object.create(null);
 // 记录原生 onxxxxx 的 PropertyDescriptor
 const eventDescs: Record<string, PropertyDescriptor> = Object.create(null);
 
+// 在 USE_PSEUDO_WINDOW 情况下，由于没有 类的prototype, 父类的成员要手动传下去
+const protoBaseDescs: Record<string, PropertyDescriptor> = Object.create(null);
+
 // 包含物件本身及所有父类(不包含Object)的PropertyDescriptor
 // 主要是找出哪些 function值， setter/getter 需要替换 global window
 getAllPropertyDescriptors(global, ([key, desc]) => {
@@ -194,6 +197,18 @@ getAllPropertyDescriptors(global, ([key, desc]) => {
         value: boundValue,
       };
       descsCache.add(key); // 必须：子类属性覆盖父类属性
+    } else if (!(key in initOwnDescs) && !Object.hasOwn(global, key)) {
+      if (!protoBaseDescs[key]) {
+        if (typeof value === "function") {
+          const boundValue = value.bind(global);
+          protoBaseDescs[key] = {
+            ...desc,
+            value: boundValue,
+          };
+        } else {
+          protoBaseDescs[key] = { ...desc };
+        }
+      }
     }
   } else {
     if (desc.configurable && desc.get && desc.set && desc.enumerable && key.startsWith("on")) {
@@ -248,6 +263,7 @@ Object.defineProperty(PseudoWindowPrototype, "__proto__", {
 
 const sharedInitCopy = USE_PSEUDO_WINDOW
   ? Object.create(null, {
+      ...protoBaseDescs, // 较快的 @unwrap 注入时有机会改变 EventTarget.prototype
       ...Object.getOwnPropertyDescriptors(PseudoWindowPrototype),
       ...initOwnDescs,
       ...overridedDescs,