Revenuecat React-Native iPad Purchases.purchasePackage - promise not settling

using

"react": "16.9.0",
"react-native": "0.61.5",
"react-native-purchases": "^3.0.6",

We're having a problem on an 11" iPad running through testflight on iOS version 13.3.1. Everything works on all simulators, and our iPhones and other iPads running on testflight work properly as well.

The problem is that the promise returned by Purchases.purchasePackage is neither resolving nor rejecting - it hangs. After combing thru the native Obj-C code, I've found relevant code in the file Pods/Purchases/RCPurchases.m. The method

- (void)purchaseProduct:(SKProduct *)product withPayment:(SKMutablePayment *)payment withPresentedOfferingIdentifier:(nullable NSString *)presentedOfferingIdentifier completion:(RCPurchaseCompletedBlock)completion

is getting invoked, and the line

[self.storeKitWrapper addPayment:[payment copy]];

is called, but the callback method

- (void)storeKitWrapper:(RCStoreKitWrapper *)storeKitWrapper
     updatedTransaction:(SKPaymentTransaction *)transaction

is never invoked. Could this be an underlying issue with SKPaymentQueue?

Thanks!