diff --git a/impl/src/main/java/org/jboss/weld/invokable/AsyncHandlerRegistry.java b/impl/src/main/java/org/jboss/weld/invokable/AsyncHandlerRegistry.java
index 202235e36c..402936a8fa 100644
--- a/impl/src/main/java/org/jboss/weld/invokable/AsyncHandlerRegistry.java
+++ b/impl/src/main/java/org/jboss/weld/invokable/AsyncHandlerRegistry.java
@@ -69,7 +69,7 @@ private void validateAndRegisterReturnType(AsyncHandler.ReturnType<?> handler) {
         validateDirectImplementation(handlerClass, AsyncHandler.ReturnType.class);
         Class<?> asyncType = extractAsyncType(handlerClass, AsyncHandler.ReturnType.class);
         checkDuplicate(asyncType, handlerClass, true);
-        handlers.put(asyncType, HandlerInfo.returnType(handler, asyncType));
+        handlers.putIfAbsent(asyncType, HandlerInfo.returnType(handler, asyncType));
     }
 
     private void validateAndRegisterParameterType(AsyncHandler.ParameterType<?> handler) {
@@ -77,7 +77,7 @@ private void validateAndRegisterParameterType(AsyncHandler.ParameterType<?> hand
         validateDirectImplementation(handlerClass, AsyncHandler.ParameterType.class);
         Class<?> asyncType = extractAsyncType(handlerClass, AsyncHandler.ParameterType.class);
         checkDuplicate(asyncType, handlerClass, false);
-        handlers.put(asyncType, HandlerInfo.parameterType(handler, asyncType));
+        handlers.putIfAbsent(asyncType, HandlerInfo.parameterType(handler, asyncType));
     }
 
     private void validateDirectImplementation(Class<?> handlerClass, Class<?> targetInterface) {
@@ -92,6 +92,15 @@ private void validateDirectImplementation(Class<?> handlerClass, Class<?> target
     private void checkDuplicate(Class<?> asyncType, Class<?> handlerClass, boolean isReturnType) {
         HandlerInfo existing = handlers.get(asyncType);
         if (existing != null && !existing.isBuiltin()) {
+            // In a WAR with multiple BDAs (e.g. WEB-INF/classes + JARs in WEB-INF/lib),
+            // all BDAs share the same classloader. Since discovery runs per BDA, the same
+            // service file is found multiple times, yielding the same handler class.
+            // This is not an error — skip re-registration. In an EAR with isolated module
+            // classloaders, different Class objects would be loaded, so this identity check
+            // does not suppress genuine duplicates across modules.
+            if (existing.getHandlerClass() == handlerClass && existing.isReturnType() == isReturnType) {
+                return;
+            }
             if (existing.getHandlerClass() == handlerClass && existing.isReturnType() != isReturnType) {
                 throw InvokerLogger.LOG.asyncHandlerBothKinds(handlerClass, asyncType);
             }
diff --git a/pom.xml b/pom.xml
index 902131ab95..07fad42500 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,7 +61,7 @@
         <arquillian.tomcat.version>1.2.4.Final</arquillian.tomcat.version>
         <atinject.tck.version>2.0.1</atinject.tck.version>
         <!-- Version of the CDI 4.1 TCK release -->
-        <cdi.tck.version>5.0.0.Alpha2</cdi.tck.version>
+        <cdi.tck.version>5.0.0.Alpha7</cdi.tck.version>
         <!-- Version of the Jakarta Platform TCK 4.1 release -->
         <platform.tck.version>11.0.3</platform.tck.version>
         <!-- By default, each mvn profile uses corresponding file from TCK repo, see jboss-tck-runner/pom.xml -->
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/LibraryBean.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/LibraryBean.java
new file mode 100644
index 0000000000..13834321dc
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/LibraryBean.java
@@ -0,0 +1,10 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import jakarta.enterprise.context.ApplicationScoped;
+
+@ApplicationScoped
+public class LibraryBean {
+    public String ping() {
+        return "pong";
+    }
+}
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncType.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncType.java
new file mode 100644
index 0000000000..0035e92207
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncType.java
@@ -0,0 +1,15 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import java.util.concurrent.CompletableFuture;
+
+public interface MyAsyncType<T> {
+    boolean isComplete();
+
+    T getIfComplete();
+
+    MyAsyncType<T> whenComplete(Runnable callback);
+
+    static <T> MyAsyncType<T> from(CompletableFuture<T> future) {
+        return new MyAsyncTypeImpl<>(future);
+    }
+}
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncTypeHandler.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncTypeHandler.java
new file mode 100644
index 0000000000..f70ea92a1b
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncTypeHandler.java
@@ -0,0 +1,10 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import jakarta.enterprise.invoke.AsyncHandler;
+
+public class MyAsyncTypeHandler<T> implements AsyncHandler.ReturnType<MyAsyncType<T>> {
+    @Override
+    public MyAsyncType<T> transform(MyAsyncType<T> original, Runnable completion) {
+        return original.whenComplete(completion);
+    }
+}
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncTypeImpl.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncTypeImpl.java
new file mode 100644
index 0000000000..9fc00f40bc
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/MyAsyncTypeImpl.java
@@ -0,0 +1,36 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import java.util.concurrent.CompletableFuture;
+
+final class MyAsyncTypeImpl<T> implements MyAsyncType<T> {
+    private final CompletableFuture<T> future;
+    private Runnable callback;
+
+    MyAsyncTypeImpl(CompletableFuture<T> future) {
+        this.future = future;
+    }
+
+    @Override
+    public boolean isComplete() {
+        return future.isDone();
+    }
+
+    @Override
+    public T getIfComplete() {
+        if (future.isDone()) {
+            return future.getNow(null);
+        }
+        throw new IllegalStateException("not yet complete");
+    }
+
+    @Override
+    public MyAsyncType<T> whenComplete(Runnable callback) {
+        this.callback = callback;
+        future.whenComplete((v, e) -> {
+            if (this.callback != null) {
+                this.callback.run();
+            }
+        });
+        return this;
+    }
+}
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupAsyncHandlerTest.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupAsyncHandlerTest.java
new file mode 100644
index 0000000000..a5b5fdb72e
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupAsyncHandlerTest.java
@@ -0,0 +1,79 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.concurrent.CompletableFuture;
+
+import jakarta.enterprise.inject.spi.Extension;
+import jakarta.enterprise.invoke.AsyncHandler;
+import jakarta.inject.Inject;
+
+import org.jboss.arquillian.container.test.api.Deployment;
+import org.jboss.arquillian.junit.Arquillian;
+import org.jboss.shrinkwrap.api.Archive;
+import org.jboss.shrinkwrap.api.BeanArchive;
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.EmptyAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.jboss.shrinkwrap.api.spec.WebArchive;
+import org.jboss.weld.test.util.Utils;
+import org.jboss.weld.tests.category.Integration;
+import org.jboss.weld.tests.invokable.async.DependentBean;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.runner.RunWith;
+
+/**
+ * Verifies that async handler discovery works in a WAR with multiple BDAs
+ * sharing the same classloader. The service file in WEB-INF/classes is visible
+ * to all BDAs, so the handler must be deduplicated rather than rejected.
+ */
+@RunWith(Arquillian.class)
+@Category(Integration.class)
+public class WarDedupAsyncHandlerTest {
+
+    @Deployment
+    public static Archive<?> deploy() {
+        // The library JAR creates a second BDA within the WAR. Both BDAs share
+        // the WAR classloader, so async handler discovery (which runs per BDA)
+        // finds the same META-INF/services/ file twice.
+        JavaArchive lib = ShrinkWrap.create(BeanArchive.class)
+                .addClass(LibraryBean.class);
+
+        return ShrinkWrap
+                .create(WebArchive.class, Utils.getDeploymentNameAsHash(WarDedupAsyncHandlerTest.class, Utils.ARCHIVE_TYPE.WAR))
+                .addClasses(WarDedupBean.class, WarDedupExtension.class,
+                        MyAsyncType.class, MyAsyncTypeImpl.class, MyAsyncTypeHandler.class,
+                        DependentBean.class)
+                .addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml")
+                .addAsServiceProvider(Extension.class, WarDedupExtension.class)
+                .addAsServiceProvider(AsyncHandler.ReturnType.class, MyAsyncTypeHandler.class)
+                .addAsLibrary(lib);
+    }
+
+    @Inject
+    WarDedupExtension extension;
+
+    @Test
+    @SuppressWarnings("unchecked")
+    public void testCustomReturnTypeHandlerInWar() throws Exception {
+        DependentBean.reset();
+        CompletableFuture<String> future = new CompletableFuture<>();
+
+        assertEquals(0, DependentBean.destroyedCounter.get());
+
+        MyAsyncType<String> result = (MyAsyncType<String>) extension.getInvoker()
+                .invoke(null, new Object[] { null, future });
+
+        assertEquals(0, DependentBean.destroyedCounter.get());
+        assertFalse(result.isComplete());
+
+        future.complete("dedup");
+
+        assertEquals(1, DependentBean.destroyedCounter.get());
+        assertTrue(result.isComplete());
+        assertEquals("dedup", result.getIfComplete());
+    }
+}
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupBean.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupBean.java
new file mode 100644
index 0000000000..fa8be0b512
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupBean.java
@@ -0,0 +1,14 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import java.util.concurrent.CompletableFuture;
+
+import jakarta.enterprise.context.ApplicationScoped;
+
+import org.jboss.weld.tests.invokable.async.DependentBean;
+
+@ApplicationScoped
+public class WarDedupBean {
+    public MyAsyncType<String> hello(DependentBean dep, CompletableFuture<String> future) {
+        return MyAsyncType.from(future);
+    }
+}
diff --git a/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupExtension.java b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupExtension.java
new file mode 100644
index 0000000000..4890c92e6e
--- /dev/null
+++ b/tests-arquillian/src/test/java/org/jboss/weld/tests/invokable/async/wardedup/WarDedupExtension.java
@@ -0,0 +1,35 @@
+package org.jboss.weld.tests.invokable.async.wardedup;
+
+import java.util.Collection;
+
+import jakarta.enterprise.event.Observes;
+import jakarta.enterprise.inject.spi.AfterDeploymentValidation;
+import jakarta.enterprise.inject.spi.AnnotatedMethod;
+import jakarta.enterprise.inject.spi.Extension;
+import jakarta.enterprise.inject.spi.ProcessManagedBean;
+import jakarta.enterprise.invoke.Invoker;
+
+public class WarDedupExtension implements Extension {
+
+    private Invoker<WarDedupBean, ?> invoker;
+
+    public void observeBean(@Observes ProcessManagedBean<WarDedupBean> pmb) {
+        Collection<AnnotatedMethod<? super WarDedupBean>> methods = pmb.getAnnotatedBeanClass().getMethods();
+        for (AnnotatedMethod<? super WarDedupBean> m : methods) {
+            if ("hello".equals(m.getJavaMember().getName())) {
+                invoker = pmb.createInvoker(m)
+                        .withInstanceLookup()
+                        .withArgumentLookup(0)
+                        .build();
+            }
+        }
+    }
+
+    public void validate(@Observes AfterDeploymentValidation adv) {
+        adv.ensureAsyncHandlerExists(MyAsyncType.class);
+    }
+
+    public Invoker<WarDedupBean, ?> getInvoker() {
+        return invoker;
+    }
+}