subscriptionsByProductIdentifier is empty on Android for user with active subscriptions

[niklasamslgruber]

• I have updated Purchases SDK to the latest version
• I have read the Contribution Guidelines
• I have searched the Community
• I have read docs.revenuecat.com
• I have searched for existing Github issues

Describe the bug
The variable subscriptionsByProductIdentifier on the CustomerInfo object is empty on Android (built with React Native). On iOS it works though. In the CustomerInfo I get activeSubscriptions and entitlements including all the metadata like expiration and purchase dates, but the subscriptionsByProductIdentifier is just empty while it SHOULD contain all my subscriptions keyed by their ID.

1. Environment
   1. Platform: Android
   2. SDK version: 8.17.0
   3. OS version: Any
   4. Android Studio version: Any
   5. How widespread is the issue. 10%
2. Steps to reproduce, with a description of expected vs. actual behavior
   CustomerInfo with Purchases.sharedInstance.getCustomerInfo for a user with an active subscription and checkout the value of customerInfo.subscriptionsByProductIdentifier

Additional context
This issue also happens on the React Native SDK on Android, see here: RevenueCat/react-native-purchases#1248 (comment)

[RCGitBot]

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