diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/freeform/FreeformTaskListener.java b/libs/WindowManager/Shell/src/com/android/wm/shell/freeform/FreeformTaskListener.java
index 6fea203..880c18b 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/freeform/FreeformTaskListener.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/freeform/FreeformTaskListener.java
@@ -125,7 +125,7 @@
                 repository.updateVisibleFreeformTasks(taskInfo.displayId, taskInfo.taskId, false);
             });
         }
-
+        mWindowDecorationViewModel.onTaskVanished(taskInfo);
         if (!Transitions.ENABLE_SHELL_TRANSITIONS) {
             mWindowDecorationViewModel.destroyWindowDecoration(taskInfo);
         }
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/fullscreen/FullscreenTaskListener.java b/libs/WindowManager/Shell/src/com/android/wm/shell/fullscreen/FullscreenTaskListener.java
index 998728d6..2626e73 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/fullscreen/FullscreenTaskListener.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/fullscreen/FullscreenTaskListener.java
@@ -161,7 +161,7 @@
         ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TASK_ORG, "Fullscreen Task Vanished: #%d",
                 taskInfo.taskId);
         mTasks.remove(taskInfo.taskId);
-
+        mWindowDecorViewModelOptional.ifPresent(v -> v.onTaskVanished(taskInfo));
         if (Transitions.ENABLE_SHELL_TRANSITIONS) return;
         if (mWindowDecorViewModelOptional.isPresent()) {
             mWindowDecorViewModelOptional.get().destroyWindowDecoration(taskInfo);
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
index f41bca3..1e305c5 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
@@ -260,6 +260,7 @@
     public void onTaskVanished(ActivityManager.RunningTaskInfo taskInfo) {
         ProtoLog.d(WM_SHELL_SPLIT_SCREEN, "onTaskVanished: task=%d", taskInfo.taskId);
         final int taskId = taskInfo.taskId;
+        mWindowDecorViewModel.ifPresent(vm -> vm.onTaskVanished(taskInfo));
         if (mRootTaskInfo.taskId == taskId) {
             mCallbacks.onRootTaskVanished();
             mRootTaskInfo = null;
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecorViewModel.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecorViewModel.java
index 87dc391..e85cb64 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecorViewModel.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecorViewModel.java
@@ -119,6 +119,21 @@
     }
 
     @Override
+    public void onTaskVanished(RunningTaskInfo taskInfo) {
+        // A task vanishing doesn't necessarily mean the task was closed, it could also mean its
+        // windowing mode changed. We're only interested in closing tasks so checking whether
+        // its info still exists in the task organizer is one way to disambiguate.
+        final boolean closed = mTaskOrganizer.getRunningTaskInfo(taskInfo.taskId) == null;
+        if (closed) {
+            // Destroying the window decoration is usually handled when a TRANSIT_CLOSE transition
+            // changes happen, but there are certain cases in which closing tasks aren't included
+            // in transitions, such as when a non-visible task is closed. See b/296921167.
+            // Destroy the decoration here in case the lack of transition missed it.
+            destroyWindowDecoration(taskInfo);
+        }
+    }
+
+    @Override
     public void onTaskChanging(
             RunningTaskInfo taskInfo,
             SurfaceControl taskSurface,
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java
index 01175f5..cd7d91b 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java
@@ -35,6 +35,7 @@
 import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_TOP_OR_LEFT;
 import static com.android.wm.shell.compatui.AppCompatUtils.isSingleTopActivityTranslucent;
 import static com.android.wm.shell.desktopmode.DesktopModeVisualIndicator.IndicatorType.TO_FULLSCREEN_INDICATOR;
+import static com.android.wm.shell.protolog.ShellProtoLogGroup.WM_SHELL_DESKTOP_MODE;
 import static com.android.wm.shell.splitscreen.SplitScreen.STAGE_TYPE_UNDEFINED;
 
 import android.annotation.NonNull;
@@ -72,6 +73,7 @@
 import androidx.annotation.Nullable;
 
 import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.protolog.common.ProtoLog;
 import com.android.window.flags.Flags;
 import com.android.wm.shell.R;
 import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
@@ -309,6 +311,22 @@
     }
 
     @Override
+    public void onTaskVanished(RunningTaskInfo taskInfo) {
+        // A task vanishing doesn't necessarily mean the task was closed, it could also mean its
+        // windowing mode changed. We're only interested in closing tasks so checking whether
+        // its info still exists in the task organizer is one way to disambiguate.
+        final boolean closed = mTaskOrganizer.getRunningTaskInfo(taskInfo.taskId) == null;
+        ProtoLog.v(WM_SHELL_DESKTOP_MODE, "Task Vanished: #%d closed=%b", taskInfo.taskId, closed);
+        if (closed) {
+            // Destroying the window decoration is usually handled when a TRANSIT_CLOSE transition
+            // changes happen, but there are certain cases in which closing tasks aren't included
+            // in transitions, such as when a non-visible task is closed. See b/296921167.
+            // Destroy the decoration here in case the lack of transition missed it.
+            destroyWindowDecoration(taskInfo);
+        }
+    }
+
+    @Override
     public void onTaskChanging(
             RunningTaskInfo taskInfo,
             SurfaceControl taskSurface,
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecorViewModel.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecorViewModel.java
index 01a6012..1563259 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecorViewModel.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/WindowDecorViewModel.java
@@ -67,6 +67,14 @@
     void onTaskInfoChanged(ActivityManager.RunningTaskInfo taskInfo);
 
     /**
+     * Notifies a task has vanished, which can mean that the task changed windowing mode or was
+     * removed.
+     *
+     * @param taskInfo the task info of the task
+     */
+    void onTaskVanished(ActivityManager.RunningTaskInfo taskInfo);
+
+    /**
      * Notifies a transition is about to start about the given task to give the window decoration a
      * chance to prepare for this transition. Unlike {@link #onTaskInfoChanged}, this method creates
      * a window decoration if one does not exist but is required.