diff --git a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractDefaultRestrictionsTest.java b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractDefaultRestrictionsTest.java
index da633c0..00f67f4 100644
--- a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractDefaultRestrictionsTest.java
+++ b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractDefaultRestrictionsTest.java
@@ -16,7 +16,7 @@
 
 package com.android.cts.netpolicy.hostside;
 
-import static android.app.ActivityManager.PROCESS_STATE_TOP_SLEEPING;
+import static android.app.ActivityManager.PROCESS_STATE_LAST_ACTIVITY;
 
 import static org.junit.Assume.assumeTrue;
 
@@ -46,14 +46,15 @@
     public final void tearDown() throws Exception {
         super.tearDown();
 
+        stopApp();
         removePowerSaveModeWhitelist(TEST_APP2_PKG);
         removePowerSaveModeExceptIdleWhitelist(TEST_APP2_PKG);
     }
 
     @Test
     public void testFgsNetworkAccess() throws Exception {
-        assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-        SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+        assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
+        SystemClock.sleep(mProcessStateTransitionShortDelayMs);
         assertNetworkAccess(false, null);
 
         launchComponentAndAssertNetworkAccess(TYPE_COMPONENT_FOREGROUND_SERVICE);
@@ -61,8 +62,8 @@
 
     @Test
     public void testActivityNetworkAccess() throws Exception {
-        assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-        SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+        assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
+        SystemClock.sleep(mProcessStateTransitionShortDelayMs);
         assertNetworkAccess(false, null);
 
         launchComponentAndAssertNetworkAccess(TYPE_COMPONENT_ACTIVTIY);
@@ -70,23 +71,23 @@
 
     @Test
     public void testBackgroundNetworkAccess_inFullAllowlist() throws Exception {
-        assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-        SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+        assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
+        SystemClock.sleep(mProcessStateTransitionShortDelayMs);
         assertNetworkAccess(false, null);
 
         addPowerSaveModeWhitelist(TEST_APP2_PKG);
-        assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
+        assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
         assertNetworkAccess(true, null);
     }
 
     @Test
     public void testBackgroundNetworkAccess_inExceptIdleAllowlist() throws Exception {
-        assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-        SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+        assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
+        SystemClock.sleep(mProcessStateTransitionShortDelayMs);
         assertNetworkAccess(false, null);
 
         addPowerSaveModeExceptIdleWhitelist(TEST_APP2_PKG);
-        assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
+        assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
         assertNetworkAccess(true, null);
     }
 }
diff --git a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractRestrictBackgroundNetworkTestCase.java b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractRestrictBackgroundNetworkTestCase.java
index d0203c5..0f5f58c 100644
--- a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractRestrictBackgroundNetworkTestCase.java
+++ b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/AbstractRestrictBackgroundNetworkTestCase.java
@@ -96,7 +96,12 @@
     protected static final String TEST_PKG = "com.android.cts.netpolicy.hostside";
     protected static final String TEST_APP2_PKG = "com.android.cts.netpolicy.hostside.app2";
     // TODO(b/321797685): Configure it via device-config once it is available.
-    protected static final long PROCESS_STATE_TRANSITION_DELAY_MS = TimeUnit.SECONDS.toMillis(5);
+    protected final long mProcessStateTransitionLongDelayMs =
+            useDifferentDelaysForBackgroundChain() ? TimeUnit.SECONDS.toMillis(20)
+                    : TimeUnit.SECONDS.toMillis(5);
+    protected final long mProcessStateTransitionShortDelayMs =
+            useDifferentDelaysForBackgroundChain() ? TimeUnit.SECONDS.toMillis(2)
+                    : TimeUnit.SECONDS.toMillis(5);
 
     private static final String TEST_APP2_ACTIVITY_CLASS = TEST_APP2_PKG + ".MyActivity";
     private static final String TEST_APP2_SERVICE_CLASS = TEST_APP2_PKG + ".MyForegroundService";
@@ -241,6 +246,22 @@
         return Boolean.parseBoolean(output);
     }
 
+    /**
+     * Check if the flag to use different delays for sensitive proc-states is enabled.
+     * This is a manual check because the feature flag infrastructure may not be available
+     * in all the branches that will get this code.
+     * TODO: b/322115994 - Use @RequiresFlagsEnabled with
+     * Flags.FLAG_USE_DIFFERENT_DELAYS_FOR_BACKGROUND_CHAIN once the tests are moved to cts.
+     */
+    private boolean useDifferentDelaysForBackgroundChain() {
+        if (!SdkLevel.isAtLeastV()) {
+            return false;
+        }
+        final String output = executeShellCommand("device_config get backstage_power"
+                + " com.android.server.net.use_different_delays_for_background_chain");
+        return Boolean.parseBoolean(output);
+    }
+
     protected int getUid(String packageName) throws Exception {
         return mContext.getPackageManager().getPackageUid(packageName, 0);
     }
@@ -824,6 +845,10 @@
         assertDelayedShellCommand("dumpsys deviceidle get deep", enabled ? "IDLE" : "ACTIVE");
     }
 
+    protected void stopApp() {
+        executeSilentShellCommand("am stop-app " + TEST_APP2_PKG);
+    }
+
     protected void setAppIdle(boolean isIdle) throws Exception {
         setAppIdleNoAssert(isIdle);
         assertAppIdle(isIdle);
diff --git a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/ConnOnActivityStartTest.java b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/ConnOnActivityStartTest.java
index 811190f..bfccce9 100644
--- a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/ConnOnActivityStartTest.java
+++ b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/ConnOnActivityStartTest.java
@@ -53,7 +53,7 @@
     @After
     public final void tearDown() throws Exception {
         super.tearDown();
-        finishActivity();
+        stopApp();
         resetDeviceState();
     }
 
@@ -108,7 +108,7 @@
         assumeTrue("Feature not enabled", isNetworkBlockedForTopSleepingAndAbove());
         assertLaunchedActivityHasNetworkAccess("testStartActivity_default", () -> {
             assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-            SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+            SystemClock.sleep(mProcessStateTransitionLongDelayMs);
             assertNetworkAccess(false, null);
         });
     }
diff --git a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkCallbackTest.java b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkCallbackTest.java
index 7038d02..3934cfa 100644
--- a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkCallbackTest.java
+++ b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkCallbackTest.java
@@ -268,6 +268,7 @@
         setRestrictBackground(false);
         setBatterySaverMode(false);
         unregisterNetworkCallback();
+        stopApp();
 
         if (SdkLevel.isAtLeastT() && (mCtsNetUtils != null)) {
             mCtsNetUtils.restorePrivateDnsSetting();
@@ -387,7 +388,7 @@
 
             finishActivity();
             assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-            SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+            SystemClock.sleep(mProcessStateTransitionLongDelayMs);
             assertNetworkAccess(false, null);
             mTestNetworkCallback.expectBlockedStatusCallbackEventually(mNetwork, true);
             assertNetworkAccessBlockedByBpf(true, mUid, true /* metered */);
@@ -413,7 +414,7 @@
 
             finishActivity();
             assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-            SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+            SystemClock.sleep(mProcessStateTransitionLongDelayMs);
             assertNetworkAccess(false, null);
             mTestNetworkCallback.expectBlockedStatusCallbackEventually(mNetwork, true);
             assertNetworkAccessBlockedByBpf(true, mUid, false /* metered */);
diff --git a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkPolicyManagerTest.java b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkPolicyManagerTest.java
index 9b3fe9f..6c5f2ff 100644
--- a/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkPolicyManagerTest.java
+++ b/tests/cts/hostside-network-policy/app/src/com/android/cts/netpolicy/hostside/NetworkPolicyManagerTest.java
@@ -17,6 +17,7 @@
 package com.android.cts.netpolicy.hostside;
 
 import static android.app.ActivityManager.PROCESS_STATE_BOUND_FOREGROUND_SERVICE;
+import static android.app.ActivityManager.PROCESS_STATE_LAST_ACTIVITY;
 import static android.app.ActivityManager.PROCESS_STATE_TOP_SLEEPING;
 import static android.os.Process.SYSTEM_UID;
 
@@ -65,6 +66,7 @@
         setRestrictBackground(false);
         setRestrictedNetworkingMode(false);
         unregisterNetworkCallback();
+        stopApp();
     }
 
     @Test
@@ -248,8 +250,8 @@
         assumeTrue("Feature not enabled", isNetworkBlockedForTopSleepingAndAbove());
 
         try {
-            assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-            SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+            assertProcessStateBelow(PROCESS_STATE_LAST_ACTIVITY);
+            SystemClock.sleep(mProcessStateTransitionShortDelayMs);
             assertNetworkingBlockedStatusForUid(mUid, METERED, true /* expectedResult */);
             assertTrue(isUidNetworkingBlocked(mUid, NON_METERED));
 
@@ -260,7 +262,7 @@
 
             finishActivity();
             assertProcessStateBelow(PROCESS_STATE_TOP_SLEEPING);
-            SystemClock.sleep(PROCESS_STATE_TRANSITION_DELAY_MS);
+            SystemClock.sleep(mProcessStateTransitionLongDelayMs);
             assertNetworkingBlockedStatusForUid(mUid, METERED, true /* expectedResult */);
             assertTrue(isUidNetworkingBlocked(mUid, NON_METERED));