How to reproduce:
1. Install Unity IAP example app and make sure it's upgraded to Unity IAP v2.6.0 in the Package Manager. You may need to revise callbacks due to new string parameter.
2. Make sure there are Google Play registered non-consumable products to purchase.
3. Run the app on Android and then purchase a non-consumable item.
4. Quit and terminate the app using the Android System square button.
5. Remove all Google Accounts via Android Settings > Google > Accounts.
6. Clear the storage+cache for the UnityIAP app from Android settings.
7. Run the app. Unity IAP should fail to initialize with an error PurchasingUnavailable.
8. Leave the app but don't terminate it. Go to Android Settings > Google > Accounts and add a new Google Account via login process.
9. Once the account is logged in, return to the Unity app.

Expected result: The SDK client should receive an initialize callback and then Unity IAP should attempt to refresh the product list, having registered the products given to it by the client's previous call to UnityPurchasing.Initialize().
Actual result: Unity IAP will attempt to refresh purchased products and generate an error about the previously-purchased non-consumable. Then right after this, the app will receive an IStoreListener.OnInitialized() callback (now that the user has logged in).

Reproducible with: 2020.3.46f1 (User reported)
Could not test with: 2020.3.47f1, 2021.3.24f1, 2022.2.17f1, 2023.1.0b14, 2023.2.0a12 - Project was not provided

Built with: macOS 12.6.1 (M1 Max)

Error format:
"Unity IAP: Unable to process purchase with order id: GPA.AAAA-BBBB-CCCC-DDDDD and purchase token: abcdefghijklmnop because the product details associated with the purchased products were not found."