WatchOS 6.4 beta purchases empty receipt

Originator:andy
Number:rdar://FB7622829 Date Originated:
Status:Open Resolved:
Product:App Store Product Version:Watch OS 6.4 beta
Classification: Reproducible:yes
 
When making purchases using watchOS 6.4 beta (this has been happening on all beta versions released as of 03/11/2020): 
- The purchase goes through correctly, I get the iOS prompts for the App Store password, and confirm the purchase.
- However, the SKReceiptRefreshRequest fails, and the receipt is not stored on device. When trying to fetch the receipt in the appStoreReceiptURL, the file is not present. 
- The iOS version of the very same app works correctly and succeeds in fetching the receipt. 
- I’m logged out of the App Store account on both iPhone and Watch, and logged into a Sandbox account on both. 
- The Sandbox account is correctly configured for the app and works correctly on the iOS version. 
- The confirmation prompts on the watch correctly show that I’m using the Sandbox environment.

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