AppStore.sync() not restoring purchases

On an app that was using the old API for In-App Purchases (StoreKit 1). The app is already published on the App Store. The purchase is non-consumable.

While trying to migrate to StoreKit 2, I'm unable to restore purchases. Specifically displaying and purchasing products works as expected, but when deleting and reinstalling the app, and then trying to restore purchases I can't do it.

I'm trying to restore them using the new APIs but it doesn't seem to be working. What I have tried so far:

I'm listening for transaction updates during the whole lifetime of the app, with:

Task.detached {
    for await result in Transaction.updates {
        if case let .verified(safe) = result {

        }
    }
}

I have a button that calls this method, but other than prompting to log in again with the Apple ID it doesn't seem to have any effect at all:

try? await AppStore.sync()

This doesn't return any item

for await result in Transaction.currentEntitlements {
    if case let .verified(transaction) = result {

    }
}

This doesn't return any item

for await result in Transaction.all {
    if case let .verified(transaction) = result {

    }
}

As mentioned before I'm trying this after purchasing the item and deleting the app. So I'm sure it should be able to restore the purchase. Am trying this both with a Configuration.storekit file on the simulator, and without it on a real device, in the Sandbox Environment.

Has anyone being able to restore purchases using StoreKit 2?

PD: I already filed a feedback report on Feedback Assistant, but so far the only thing that they have replied is:

Because StoreKit Testing in Xcode is a local environment, and the data is tied to the app, when you delete the app you're also deleting all the transaction data for that app in the Xcode environment. The code snippets provided are correct usage of the API.

So yes, using a Configuration.storekit file won't work on restoring purchases, but if I can't restore them on the Sandbox Environment I'm afraid that this won't work once released, leaving my users totally unable to restore what they have already purchased.