diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index 682e991..7803c73 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -2802,6 +2802,9 @@
                     false /* includingParents */);
         }
         WindowContainerTransaction wct = new WindowContainerTransaction();
+        // Clear out current windowing mode before reparenting to split taks.
+        wct.setWindowingMode(
+                task.getStack().mRemoteToken.toWindowContainerToken(), WINDOWING_MODE_UNDEFINED);
         wct.reparent(task.getStack().mRemoteToken.toWindowContainerToken(),
                 primarySplitTask.mRemoteToken.toWindowContainerToken(), toTop);
         mWindowOrganizerController.applyTransaction(wct);