diff --git a/tests/test-sessions/test-sessions-common/src/test/java/org/eclipse/jetty/server/session/DuplicateCookieTest.java b/tests/test-sessions/test-sessions-common/src/test/java/org/eclipse/jetty/server/session/DuplicateCookieTest.java
index c0f6bb10149..e18eae76c95 100644
--- a/tests/test-sessions/test-sessions-common/src/test/java/org/eclipse/jetty/server/session/DuplicateCookieTest.java
+++ b/tests/test-sessions/test-sessions-common/src/test/java/org/eclipse/jetty/server/session/DuplicateCookieTest.java
@@ -14,6 +14,7 @@
 package org.eclipse.jetty.server.session;
 
 import java.io.IOException;
+import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
 import jakarta.servlet.ServletException;
@@ -33,6 +34,7 @@ import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * Test having multiple session cookies in a request.
@@ -54,6 +56,8 @@ public class DuplicateCookieTest
         ServletHolder holder = new ServletHolder(servlet);
         ServletContextHandler contextHandler = server1.addContext(contextPath);
         contextHandler.addServlet(holder, servletMapping);
+        TestHttpChannelCompleteListener scopeListener = new TestHttpChannelCompleteListener();
+        server1.getServerConnector().addBean(scopeListener);
         server1.start();
         int port1 = server1.getPort();
 
@@ -70,6 +74,8 @@ public class DuplicateCookieTest
             assertEquals(0, s4422.getRequests());
 
             //make a request with another session cookie in there that does not exist
+            CountDownLatch latch = new CountDownLatch(1);
+            scopeListener.setExitSynchronizer(latch);
             Request request = client.newRequest("http://localhost:" + port1 + contextPath + servletMapping + "?action=check");
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=123")); //doesn't exist
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=4422")); //does exist
@@ -77,6 +83,10 @@ public class DuplicateCookieTest
             assertEquals(HttpServletResponse.SC_OK, response.getStatus());
             assertEquals("4422", response.getContentAsString());
 
+            //ensure request has finished processing so session will be completed
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
+            //check session is drained of requests
             assertEquals(0, s4422.getRequests());
         }
         finally
@@ -101,6 +111,8 @@ public class DuplicateCookieTest
         ServletHolder holder = new ServletHolder(servlet);
         ServletContextHandler contextHandler = server1.addContext(contextPath);
         contextHandler.addServlet(holder, servletMapping);
+        TestHttpChannelCompleteListener scopeListener = new TestHttpChannelCompleteListener();
+        server1.getServerConnector().addBean(scopeListener);
         server1.start();
         int port1 = server1.getPort();
 
@@ -127,6 +139,8 @@ public class DuplicateCookieTest
             assertEquals(0, s2255.getRequests());
 
             //make a request where the valid session cookie is first
+            CountDownLatch latch = new CountDownLatch(1);
+            scopeListener.setExitSynchronizer(latch);
             Request request = client.newRequest("http://localhost:" + port1 + contextPath + servletMapping + "?action=check");
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=1122")); //is valid
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=2233")); //is invalid
@@ -135,6 +149,10 @@ public class DuplicateCookieTest
             assertEquals(HttpServletResponse.SC_OK, response.getStatus());
             assertEquals("1122", response.getContentAsString());
 
+            //ensure request has finished processing so session will be completed
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
+            //check valid session is drained of requests
             assertEquals(0, s1122.getRequests());
         }
         finally
@@ -159,6 +177,8 @@ public class DuplicateCookieTest
         ServletHolder holder = new ServletHolder(servlet);
         ServletContextHandler contextHandler = server1.addContext(contextPath);
         contextHandler.addServlet(holder, servletMapping);
+        TestHttpChannelCompleteListener scopeListener = new TestHttpChannelCompleteListener();
+        server1.getServerConnector().addBean(scopeListener);
         server1.start();
         int port1 = server1.getPort();
 
@@ -185,6 +205,9 @@ public class DuplicateCookieTest
             assertEquals(0, s2255.getRequests());
 
             //make a request with the valid session cookie last
+            // Create the session
+            CountDownLatch latch = new CountDownLatch(1);
+            scopeListener.setExitSynchronizer(latch);
             Request request = client.newRequest("http://localhost:" + port1 + contextPath + servletMapping + "?action=check");
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=2233")); //is invalid
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=2255")); //is invalid
@@ -193,6 +216,10 @@ public class DuplicateCookieTest
             assertEquals(HttpServletResponse.SC_OK, response.getStatus());
             assertEquals("1122", response.getContentAsString());
 
+            //ensure request has completed so session will be completed
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
+            //check valid session drained of requests
             assertEquals(0, s1122.getRequests());
         }
         finally
@@ -217,6 +244,8 @@ public class DuplicateCookieTest
         ServletHolder holder = new ServletHolder(servlet);
         ServletContextHandler contextHandler = server1.addContext(contextPath);
         contextHandler.addServlet(holder, servletMapping);
+        TestHttpChannelCompleteListener scopeListener = new TestHttpChannelCompleteListener();
+        server1.getServerConnector().addBean(scopeListener);
         server1.start();
         int port1 = server1.getPort();
 
@@ -243,6 +272,8 @@ public class DuplicateCookieTest
             assertEquals(0, s2255.getRequests());
 
             //make a request with another session cookie with the valid session surrounded by invalids
+            CountDownLatch latch = new CountDownLatch(1);
+            scopeListener.setExitSynchronizer(latch);
             Request request = client.newRequest("http://localhost:" + port1 + contextPath + servletMapping + "?action=check");
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=2233")); //is invalid
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=1122")); //is valid
@@ -251,6 +282,10 @@ public class DuplicateCookieTest
             assertEquals(HttpServletResponse.SC_OK, response.getStatus());
             assertEquals("1122", response.getContentAsString());
 
+            //ensure request has completed so session will be completed
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
+            //check valid session drained of requests
             assertEquals(0, s1122.getRequests());
         }
         finally
@@ -275,12 +310,14 @@ public class DuplicateCookieTest
         ServletHolder holder = new ServletHolder(servlet);
         ServletContextHandler contextHandler = server1.addContext(contextPath);
         contextHandler.addServlet(holder, servletMapping);
+        TestHttpChannelCompleteListener scopeListener = new TestHttpChannelCompleteListener();
+        server1.getServerConnector().addBean(scopeListener);
         server1.start();
         int port1 = server1.getPort();
 
         try (StacklessLogging ignored = new StacklessLogging(DuplicateCookieTest.class.getPackage()))
         {
-            //create some of unexpired sessions
+            //create some unexpired sessions
             Session s1234 = createUnExpiredSession(contextHandler.getSessionHandler().getSessionCache(),
                 contextHandler.getSessionHandler().getSessionCache().getSessionDataStore(),
                 "1234");
@@ -300,13 +337,18 @@ public class DuplicateCookieTest
             assertEquals(0, s9111.getRequests());
 
             //make a request with multiple valid session ids
+            CountDownLatch latch = new CountDownLatch(1);
+            scopeListener.setExitSynchronizer(latch);
             Request request = client.newRequest("http://localhost:" + port1 + contextPath + servletMapping + "?action=check");
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=1234"));
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=5678"));
             ContentResponse response = request.send();
             assertEquals(HttpServletResponse.SC_BAD_REQUEST, response.getStatus());
 
-            //check that all valid sessions have their request counts decremented correctly after the request, back to 0
+            //ensure request has completed so any session will be completed
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
+            //check that all sessions have their request counts decremented correctly after the request, back to 0
             assertEquals(0, s1234.getRequests());
             assertEquals(0, s5678.getRequests());
             assertEquals(0, s9111.getRequests());
@@ -333,6 +375,8 @@ public class DuplicateCookieTest
         ServletHolder holder = new ServletHolder(servlet);
         ServletContextHandler contextHandler = server1.addContext(contextPath);
         contextHandler.addServlet(holder, servletMapping);
+        TestHttpChannelCompleteListener scopeListener = new TestHttpChannelCompleteListener();
+        server1.getServerConnector().addBean(scopeListener);
         server1.start();
         int port1 = server1.getPort();
 
@@ -350,12 +394,17 @@ public class DuplicateCookieTest
             assertEquals(0, s1234.getRequests());
 
             //make a request with multiple valid session ids
+            CountDownLatch latch = new CountDownLatch(1);
+            scopeListener.setExitSynchronizer(latch);
             Request request = client.newRequest("http://localhost:" + port1 + contextPath + servletMapping + "?action=check");
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=1234"));
             request.headers(headers -> headers.add("Cookie", "JSESSIONID=1234"));
             ContentResponse response = request.send();
             assertEquals(HttpServletResponse.SC_OK, response.getStatus());
 
+            //ensure request has finished processing so session will be completed
+            assertTrue(latch.await(5, TimeUnit.SECONDS));
+
             //check that all valid sessions have their request counts decremented correctly after the request, back to 0
             assertEquals(0, s1234.getRequests());
         }