diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 409ee83..467e080 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2124,6 +2124,10 @@
 
         IntSet result = new IntSet();
         if (visibleIds.isEmpty()) {
+            if (TestProtocol.sDebugTracing) {
+                Log.d(TestProtocol.NULL_INT_SET, "getPagesToBindSynchronously (1): "
+                        + result);
+            }
             return result;
         }
         for (int id : orderedScreenIds.toArray()) {
@@ -2144,6 +2148,10 @@
             // pages being hidden in single panel.
             result.add(pairId);
         }
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.NULL_INT_SET, "getPagesToBindSynchronously (2): "
+                    + result);
+        }
         return result;
     }
 
diff --git a/src/com/android/launcher3/model/BaseLoaderResults.java b/src/com/android/launcher3/model/BaseLoaderResults.java
index 0e132c2..e9feb1c 100644
--- a/src/com/android/launcher3/model/BaseLoaderResults.java
+++ b/src/com/android/launcher3/model/BaseLoaderResults.java
@@ -32,6 +32,7 @@
 import com.android.launcher3.model.data.AppInfo;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.LauncherAppWidgetInfo;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.IntSet;
 import com.android.launcher3.util.LooperExecutor;
@@ -173,8 +174,18 @@
             ArrayList<LauncherAppWidgetInfo> currentAppWidgets = new ArrayList<>();
             ArrayList<LauncherAppWidgetInfo> otherAppWidgets = new ArrayList<>();
 
+            if (TestProtocol.sDebugTracing) {
+                Log.d(TestProtocol.NULL_INT_SET, "bind (1) currentScreenIds: "
+                        + currentScreenIds
+                        + ", mCallBacks: "
+                        + mCallbacks.getClass().getSimpleName());
+            }
             filterCurrentWorkspaceItems(currentScreenIds, mWorkspaceItems, currentWorkspaceItems,
                     otherWorkspaceItems);
+            if (TestProtocol.sDebugTracing) {
+                Log.d(TestProtocol.NULL_INT_SET, "bind (2) currentScreenIds: "
+                        + currentScreenIds);
+            }
             filterCurrentWorkspaceItems(currentScreenIds, mAppWidgets, currentAppWidgets,
                     otherAppWidgets);
             final InvariantDeviceProfile idp = mApp.getInvariantDeviceProfile();
diff --git a/src/com/android/launcher3/model/ModelUtils.java b/src/com/android/launcher3/model/ModelUtils.java
index 58aa9e5..ef5eef1 100644
--- a/src/com/android/launcher3/model/ModelUtils.java
+++ b/src/com/android/launcher3/model/ModelUtils.java
@@ -31,6 +31,7 @@
 import com.android.launcher3.icons.LauncherIcons;
 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.IntArray;
 import com.android.launcher3.util.IntSet;
 
@@ -66,6 +67,10 @@
                 (lhs, rhs) -> Integer.compare(lhs.container, rhs.container));
         for (T info : allWorkspaceItems) {
             if (info.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
+                if (TestProtocol.sDebugTracing) {
+                    Log.d(TestProtocol.NULL_INT_SET, "filterCurrentWorkspaceItems: "
+                            + currentScreenIds);
+                }
                 if (currentScreenIds.contains(info.screenId)) {
                     currentScreenItems.add(info);
                     itemsOnScreen.add(info.id);
diff --git a/src/com/android/launcher3/testing/TestProtocol.java b/src/com/android/launcher3/testing/TestProtocol.java
index 3aecaa5..1d73d03 100644
--- a/src/com/android/launcher3/testing/TestProtocol.java
+++ b/src/com/android/launcher3/testing/TestProtocol.java
@@ -118,4 +118,5 @@
     public static final String WORK_PROFILE_REMOVED = "b/159671700";
     public static final String TASK_VIEW_ID_CRASH = "b/195430732";
     public static final String NO_DROP_TARGET = "b/195031154";
+    public static final String NULL_INT_SET = "b/200572078";
 }