Store purchases or app download progress in iOS 14.5 with the SKStoreProductViewController failed

I’m developing a custom keyboard extension:
https://developer.apple.com/design/human-interface-guidelines/ios/extensions/custom-keyboards/

In some cases, i need to call SKStoreProductViewController to display a store for users to purchase media from the App Store:
https://developer.apple.com/documentation/storekit/skstoreproductviewcontroller

However, the download or purchase progress cannot be completed in iOS 14.5 after entering the user’s password, but there is no problem in iOS 14.4.2.

Here's the screen recording video:
drive.google.com/file/d/17mnT9WnK6BNyR7geMMsfhs_l6mvu-C_P/view?usp=sharing

Anyone can help me to solve this problem?