diff --git a/src/com/android/launcher3/DropTargetBar.java b/src/com/android/launcher3/DropTargetBar.java
index 88f6c49..eb42a65 100644
--- a/src/com/android/launcher3/DropTargetBar.java
+++ b/src/com/android/launcher3/DropTargetBar.java
@@ -25,6 +25,7 @@
 import android.content.Context;
 import android.graphics.Rect;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.util.TypedValue;
 import android.view.Gravity;
 import android.view.View;
@@ -32,10 +33,13 @@
 import android.view.ViewPropertyAnimator;
 import android.widget.FrameLayout;
 
+import androidx.annotation.NonNull;
+
 import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.dragndrop.DragController;
 import com.android.launcher3.dragndrop.DragController.DragListener;
 import com.android.launcher3.dragndrop.DragOptions;
+import com.android.launcher3.testing.TestProtocol;
 
 /*
  * The top bar containing various drop targets: Delete/App Info/Uninstall.
@@ -212,6 +216,9 @@
     }
 
     public void animateToVisibility(boolean isVisible) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "8");
+        }
         if (mVisible != isVisible) {
             mVisible = isVisible;
 
@@ -238,6 +245,9 @@
      */
     @Override
     public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "7");
+        }
         animateToVisibility(true);
     }
 
@@ -261,4 +271,12 @@
     public ButtonDropTarget[] getDropTargets() {
         return mDropTargets;
     }
+
+    @Override
+    protected void onVisibilityChanged(@NonNull View changedView, int visibility) {
+        super.onVisibilityChanged(changedView, visibility);
+        if (TestProtocol.sDebugTracing && visibility == VISIBLE) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "9");
+        }
+    }
 }
diff --git a/src/com/android/launcher3/dragndrop/DragController.java b/src/com/android/launcher3/dragndrop/DragController.java
index 1e0edac..fdb2799 100644
--- a/src/com/android/launcher3/dragndrop/DragController.java
+++ b/src/com/android/launcher3/dragndrop/DragController.java
@@ -22,6 +22,7 @@
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
+import android.util.Log;
 import android.view.DragEvent;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
@@ -34,6 +35,7 @@
 import com.android.launcher3.logging.InstanceId;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.WorkspaceItemInfo;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.TouchController;
 import com.android.launcher3.views.ActivityContext;
@@ -146,6 +148,9 @@
             float initialDragViewScale,
             float dragViewScaleOnDrop,
             DragOptions options) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "4");
+        }
         return startDrag(drawable, /* view= */ null, originalView, dragLayerX, dragLayerY,
                 source, dragInfo, dragOffset, dragRegion, initialDragViewScale, dragViewScaleOnDrop,
                 options);
@@ -203,6 +208,9 @@
             DragOptions options);
 
     protected void callOnDragStart() {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "6");
+        }
         if (mOptions.preDragCondition != null) {
             mOptions.preDragCondition.onPreDragEnd(mDragObject, true /* dragStarted*/);
         }
diff --git a/src/com/android/launcher3/dragndrop/LauncherDragController.java b/src/com/android/launcher3/dragndrop/LauncherDragController.java
index 0e8b0a5..dcbfa50 100644
--- a/src/com/android/launcher3/dragndrop/LauncherDragController.java
+++ b/src/com/android/launcher3/dragndrop/LauncherDragController.java
@@ -24,6 +24,7 @@
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
+import android.util.Log;
 import android.view.HapticFeedbackConstants;
 import android.view.View;
 
@@ -36,6 +37,7 @@
 import com.android.launcher3.R;
 import com.android.launcher3.accessibility.DragViewStateAnnouncer;
 import com.android.launcher3.model.data.ItemInfo;
+import com.android.launcher3.testing.TestProtocol;
 
 /**
  * Drag controller for Launcher activity
@@ -65,6 +67,9 @@
             float initialDragViewScale,
             float dragViewScaleOnDrop,
             DragOptions options) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "5");
+        }
         if (PROFILE_DRAWING_DURING_DRAG) {
             android.os.Debug.startMethodTracing("Launcher");
         }
diff --git a/src/com/android/launcher3/testing/TestProtocol.java b/src/com/android/launcher3/testing/TestProtocol.java
index c484811..aaa39be 100644
--- a/src/com/android/launcher3/testing/TestProtocol.java
+++ b/src/com/android/launcher3/testing/TestProtocol.java
@@ -120,4 +120,5 @@
     public static final String THIRD_PARTY_LAUNCHER_NOT_SET = "b/187080582";
     public static final String TASK_VIEW_ID_CRASH = "b/195430732";
     public static final String L3_SWIPE_TO_HOME = "b/192018189";
+    public static final String NO_DROP_TARGET = "b/195031154";
 }
diff --git a/src/com/android/launcher3/widget/BaseWidgetSheet.java b/src/com/android/launcher3/widget/BaseWidgetSheet.java
index b6cec12..00a0050 100644
--- a/src/com/android/launcher3/widget/BaseWidgetSheet.java
+++ b/src/com/android/launcher3/widget/BaseWidgetSheet.java
@@ -19,6 +19,7 @@
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.View.OnLongClickListener;
@@ -108,6 +109,9 @@
 
     @Override
     public boolean onLongClick(View v) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "1");
+        }
         TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "Widgets.onLongClick");
         v.cancelLongPress();
         if (!ItemLongClickListener.canStartDrag(mActivityContext)) return false;
@@ -178,6 +182,9 @@
     }
 
     private boolean beginDraggingWidget(WidgetCell v) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "2");
+        }
         // Get the widget preview as the drag representation
         WidgetImageView image = v.getWidgetView();
 
diff --git a/src/com/android/launcher3/widget/PendingItemDragHelper.java b/src/com/android/launcher3/widget/PendingItemDragHelper.java
index 2347d28..463f4ac 100644
--- a/src/com/android/launcher3/widget/PendingItemDragHelper.java
+++ b/src/com/android/launcher3/widget/PendingItemDragHelper.java
@@ -22,6 +22,7 @@
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
+import android.util.Log;
 import android.util.Size;
 import android.view.View;
 import android.view.View.MeasureSpec;
@@ -41,6 +42,7 @@
 import com.android.launcher3.icons.FastBitmapDrawable;
 import com.android.launcher3.icons.LauncherIcons;
 import com.android.launcher3.icons.RoundDrawableWrapper;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.widget.dragndrop.AppWidgetHostViewDragListener;
 import com.android.launcher3.widget.util.WidgetSizes;
 
@@ -94,6 +96,9 @@
      */
     public void startDrag(Rect previewBounds, int previewBitmapWidth, int previewViewWidth,
             Point screenPos, DragSource source, DragOptions options) {
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NO_DROP_TARGET, "3");
+        }
         final Launcher launcher = Launcher.getLauncher(mView.getContext());
         LauncherAppState app = LauncherAppState.getInstance(launcher);