Thanks for your reply.
We are using App Store Connect API to manage development certificates now.
I've found that the new Xcode 11 is now automatically using certificates of types "Apple Development" and "Apple Distribution" instead of previous "iOS App Development", "iOS Distribution", "Mac Development" or "Mac App Distribution". And when we tried to create certificates on the developer website, we could see new types "Apple Development" and "Apple Distribution" with comments "For use in Xcode 11 or later".
But these two types are not referenced in the App Store Connect API document here https://developer.apple.com/documentation/appstoreconnectapi/certificatetype . So we're wondering if it is just not documented, or not implemented.