fix: support Selenium-decorated page elements

src/main/java/io/appium/java_client/pagefactory/ElementInterceptor.java

@@ -39,7 +39,12 @@ public ElementInterceptor(ElementLocator locator, WeakReference<WebDriver> drive
     protected Object getObject(WebElement element, Method method, Object[] args)
         throws Throwable {
         try {
-            return method.invoke(element, args);
+            Method methodToInvoke = method;
+            if (!method.getDeclaringClass().isInstance(element)) {
+                // Selenium decorators may expose WebElement without extending RemoteWebElement.
+                methodToInvoke = WebElement.class.getMethod(method.getName(), method.getParameterTypes());
+            }
+            return methodToInvoke.invoke(element, args);
         } catch (Throwable t) {
             throw extractReadableException(t);
         }

src/test/java/io/appium/java_client/pagefactory_tests/SeleniumDecoratorCompatibilityTest.java

@@ -0,0 +1,76 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * See the NOTICE file distributed with this work for additional
+ * information regarding copyright ownership.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.appium.java_client.pagefactory_tests;
+
+import io.appium.java_client.events.stubs.EmptyWebDriver;
+import io.appium.java_client.events.stubs.StubWebElement;
+import io.appium.java_client.pagefactory.AndroidFindBy;
+import io.appium.java_client.pagefactory.AppiumFieldDecorator;
+import org.junit.jupiter.api.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.WebElement;
+import org.openqa.selenium.support.PageFactory;
+import org.openqa.selenium.support.events.EventFiringDecorator;
+import org.openqa.selenium.support.events.WebDriverListener;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class SeleniumDecoratorCompatibilityTest {
+    @AndroidFindBy(id = "some_id")
+    private WebElement element;
+
+    @Test
+    public void canInvokeElementReturnedBySeleniumDecorator() {
+        CountingDriver originalDriver = new CountingDriver();
+        CountingListener listener = new CountingListener();
+        WebDriver decoratedDriver = new EventFiringDecorator<>(listener).decorate(originalDriver);
+        PageFactory.initElements(new AppiumFieldDecorator(decoratedDriver), this);
+
+        element.click();
+
+        assertEquals(1, originalDriver.element.clickCount);
+        assertEquals(1, listener.clickCount);
+    }
+
+    public static class CountingDriver extends EmptyWebDriver {
+        private final CountingElement element = new CountingElement();
+
+        @Override
+        public StubWebElement findElement(By by) {
+            return element;
+        }
+    }
+
+    public static class CountingElement extends StubWebElement {
+        private int clickCount;
+
+        @Override
+        public void click() {
+            clickCount++;
+        }
+    }
+
+    public static class CountingListener implements WebDriverListener {
+        private int clickCount;
+
+        @Override
+        public void afterClick(WebElement element) {
+            clickCount++;
+        }
+    }
+}