Unity IAPでGooglePlayのリストアボタンを設置したいが、PurchaseEventArgsが正常に取得されない。

問題定義

CodelessIAPにてIGooglePlayStoreExtensions.RestoreTransactionsでリストア処理を行ったところ、複数リストア対象があったとしてもPurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e)に1つしか送られてこない。
こちらの原因と、全リストア対象が送られてくるようにしたい。

試したこと

・複数の非消費型を購入した状態で端末テスト。
・hasReceiptでリストア判定が適正なことを確認。
・IGooglePlayStoreExtensions.RestoreTransactionsを実行したところ、１つしかPurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e)を通らない。
・複数の購入済み非消費型のうち、1つをGooglePlay購入時の自動リストア処理でリストアを行った。
・その後再度IGooglePlayStoreExtensions.RestoreTransactionsを実行したところ、PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e)を全てのリストア対象が通過した。

詳細

Android版で「購入を復元」ボタンを設けることになり、リストア処理を実装することになりました。
Unity IAPではGooglePlayのリストア処理は実装されていないので、自作することとなり、IAPButton.csのリストア処理にIGooglePlayStoreExtensionsを設けてGooglePlay用のリストア処理を実装してみました。
しかし、上記の問題が発生しうまく実装ができません。ご存知の方いらっしゃいましたら是非解決策をご教授頂きたいです。
※IAPButton.csのみGooglePlayリストア用に一部追記しております。
※CodelessIAPStoreListener.csは変更ありません。

IAPButton.cs (自作部分はコメントで記載)

C#
1#if UNITY_PURCHASING || UNITY_UNIFIED_IAP
2using UnityEngine.Events;
3using UnityEngine.UI;
4using System.IO;
5using System.Collections.Generic;
6using TMPro;
7
8namespace UnityEngine.Purchasing
9{
10    [RequireComponent(typeof(Button))]
11    [AddComponentMenu("Unity IAP/IAP Button")]
12    [HelpURL("https://docs.unity3d.com/Manual/UnityIAP.html")]
13    public class IAPButton : MonoBehaviour
14    {
15        public enum ButtonType
16        {
17            Purchase,
18            Restore
19        }
20
21        [System.Serializable]
22        public class OnPurchaseCompletedEvent : UnityEvent<Product>
23        {
24        };
25
26        [System.Serializable]
27        public class OnPurchaseFailedEvent : UnityEvent<Product, PurchaseFailureReason>
28        {
29        };
30
31        [HideInInspector]
32        public string productId;
33
34        [Tooltip("The type of this button, can be either a purchase or a restore button")]
35        public ButtonType buttonType = ButtonType.Purchase;
36
37        [Tooltip("Consume the product immediately after a successful purchase")]
38        public bool consumePurchase = true;
39
40        [Tooltip("Event fired after a successful purchase of this product")]
41        public OnPurchaseCompletedEvent onPurchaseComplete;
42
43        [Tooltip("Event fired after a failed purchase of this product")]
44        public OnPurchaseFailedEvent onPurchaseFailed;
45
46        [Tooltip("[Optional] Displays the localized title from the app store")]
47        public TextMeshProUGUI titleText;
48
49        [Tooltip("[Optional] Displays the localized description from the app store")]
50        public TextMeshProUGUI descriptionText;
51
52        [Tooltip("[Optional] Displays the localized price from the app store")]
53        public TextMeshProUGUI priceText;
54
55        void Start()
56        {
57            Button button = GetComponent<Button>();
58
59            if (buttonType == ButtonType.Purchase)
60            {
61                if (button)
62                {
63                    button.onClick.AddListener(PurchaseProduct);
64                }
65
66                if (string.IsNullOrEmpty(productId))
67                {
68                    Debug.LogError("IAPButton productId is empty");
69                }
70
71                if (!CodelessIAPStoreListener.Instance.HasProductInCatalog(productId))
72                {
73                    Debug.LogWarning("The product catalog has no product with the ID \"" + productId + "\"");
74                }
75            }
76            else if (buttonType == ButtonType.Restore)
77            {
78                if (button)
79                {
80                    button.onClick.AddListener(Restore);
81                }
82            }
83        }
84
85        //GameObject生成時に外部からproductIdを取得するため作成
86        public void Initialize(ProductCatalogItem productid)
87        {
88            productId = productid.id;
89            if (buttonType == ButtonType.Purchase)
90            {
91                CodelessIAPStoreListener.Instance.AddButton(this);
92                if (CodelessIAPStoreListener.initializationComplete)
93                {
94                    //リストア対象か確認
95                    Debug.Log("ReStore : " + CodelessIAPStoreListener.Instance.GetProduct(productId).hasReceipt);
96                    UpdateText();
97                }
98            }
99        }
100
101        //Initializeで初期化するためOnEnableは不必要に
102        void OnEnable()
103        {
104            /*
105            if (buttonType == ButtonType.Purchase)
106            {
107                CodelessIAPStoreListener.Instance.AddButton(this);
108                if (CodelessIAPStoreListener.initializationComplete)
109                {
110                    UpdateText();
111                }
112            }
113            */
114        }
115
116        void OnDisable()
117        {
118            if (buttonType == ButtonType.Purchase)
119            {
120                CodelessIAPStoreListener.Instance.RemoveButton(this);
121            }
122        }
123
124        void PurchaseProduct()
125        {
126            if (buttonType == ButtonType.Purchase)
127            {
128                Debug.Log("IAPButton.PurchaseProduct() with product ID: " + productId);
129
130                CodelessIAPStoreListener.Instance.InitiatePurchase(productId);
131            }
132        }
133
134        void Restore()
135        {
136            if (buttonType == ButtonType.Restore)
137            {
138                if (Application.platform == RuntimePlatform.WSAPlayerX86 ||
139                    Application.platform == RuntimePlatform.WSAPlayerX64 ||
140                    Application.platform == RuntimePlatform.WSAPlayerARM)
141                {
142                    CodelessIAPStoreListener.Instance.ExtensionProvider.GetExtension<IMicrosoftExtensions>()
143                        .RestoreTransactions();
144                }
145                else if (Application.platform == RuntimePlatform.IPhonePlayer ||
146                         Application.platform == RuntimePlatform.OSXPlayer ||
147                         Application.platform == RuntimePlatform.tvOS)
148                {
149                    CodelessIAPStoreListener.Instance.ExtensionProvider.GetExtension<IAppleExtensions>()
150                        .RestoreTransactions(OnTransactionsRestored);
151                }
152                else if (Application.platform == RuntimePlatform.Android &&
153                         StandardPurchasingModule.Instance().appStore == AppStore.SamsungApps)
154                {
155                    CodelessIAPStoreListener.Instance.ExtensionProvider.GetExtension<ISamsungAppsExtensions>()
156                        .RestoreTransactions(OnTransactionsRestored);
157                }
158                //GooglePlay用にリストア処理を作成
159                else if (Application.platform == RuntimePlatform.Android &&
160                            StandardPurchasingModule.Instance().appStore == AppStore.GooglePlay)
161                {
162                    CodelessIAPStoreListener.Instance.ExtensionProvider.GetExtension<IGooglePlayStoreExtensions>()
163                        .RestoreTransactions(OnTransactionsRestored);
164                }
165                else
166                {
167                    Debug.LogWarning(Application.platform.ToString() +
168                                     " is not a supported platform for the Codeless IAP restore button");
169                }
170            }
171        }
172
173        void OnTransactionsRestored(bool success)
174        {
175            Debug.Log("Transactions restored: " + success);
176        }
177
178        /**
179         *  Invoked to process a purchase of the product associated with this button
180         */
181        public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e)
182        {
183            Debug.Log(string.Format("IAPButton.ProcessPurchase(PurchaseEventArgs {0} - {1})", e,
184                e.purchasedProduct.definition.id));
185
186            onPurchaseComplete.Invoke(e.purchasedProduct);
187
188            return (consumePurchase) ? PurchaseProcessingResult.Complete : PurchaseProcessingResult.Pending;
189        }
190
191        /**
192         *  Invoked on a failed purchase of the product associated with this button
193         */
194        public void OnPurchaseFailed(Product product, PurchaseFailureReason reason)
195        {
196            Debug.Log(string.Format("IAPButton.OnPurchaseFailed(Product {0}, PurchaseFailureReason {1})", product,
197                reason));
198            
199            onPurchaseFailed.Invoke(product, reason);
200        }
201
202        internal void UpdateText()
203        {
204            var product = CodelessIAPStoreListener.Instance.GetProduct(productId);
205            if (product != null)
206            {
207                if (titleText != null)
208                {
209                    titleText.text = product.metadata.localizedTitle;
210                }
211
212                if (descriptionText != null)
213                {
214                    descriptionText.text = product.metadata.localizedDescription;
215                }
216
217                if (priceText != null)
218                {
219                    priceText.text = product.metadata.localizedPriceString;
220                }
221            }
222        }
223    }
224}
225#endif
226