fix

Runtime/engine/UIWidgetsMessageManager.cs

             if (name != this._lastObjectName) {
 #if UNITY_IOS || UNITY_ANDROID
                 if (!Application.isEditor) {
-                    UIWidgetsMessageSetObjectName(this._lastObjectName);
+                    UIWidgetsMessageSetObjectName(name);
                 }
                 this._lastObjectName = name;
 #endif

Runtime/engine/UIWidgetsPanel.cs

 
         protected override void OnEnable() {
             base.OnEnable();
-            UIWidgetsMessageManager.ensureUIWidgetsMessageManagerIfNeeded();
-
-            //Disable the default touch -> mouse event conversion on mobile devices
+           //Disable the default touch -> mouse event conversion on mobile devices
             Input.simulateMouseWithTouches = false;
 
             this._displayMetrics = DisplayMetricsProvider.provider();
 
         void Update() {
             this._displayMetrics.Update();
+            UIWidgetsMessageManager.ensureUIWidgetsMessageManagerIfNeeded();
             if (EventSystem.current != null && EventSystem.current.currentSelectedGameObject != this.gameObject) {
                 this.unfocusIfNeeded();
             }

Samples/UIWidgetSample/TextInput.unity

   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 1777916081}
   m_CullTransparentMesh: 0
---- !u!1 &1829967422
-GameObject:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  serializedVersion: 6
-  m_Component:
-  - component: {fileID: 1829967424}
-  - component: {fileID: 1829967423}
-  m_Layer: 0
-  m_Name: messageManager
-  m_TagString: Untagged
-  m_Icon: {fileID: 0}
-  m_NavMeshLayer: 0
-  m_StaticEditorFlags: 0
-  m_IsActive: 1
---- !u!114 &1829967423
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 1829967422}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: efd031068fc9d41d6b4c165afaaa25ba, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
---- !u!4 &1829967424
-Transform:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 1829967422}
-  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 0, y: 0, z: 0}
-  m_LocalScale: {x: 1, y: 1, z: 1}
-  m_Children: []
-  m_Father: {fileID: 0}
-  m_RootOrder: 4
-  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}