Can't restore purchases if promo code is used

### Platform

- [x ] iOS
- [ ] macOS
- [ ] tvOS

### In app purchase type

- [ ] Consumable
- [x ] Non-consumable
- [ ] Auto-Renewable Subscription
- [ ] Non-Renewing Subscription

### Environment

- [ x] Sandbox
- [x ] Production

### Version
0.10.7

### Related issues

## Report

### Issue summary
If I use a in-app purchase promo code, when restoring the app says it has found no restored purchases. If the item is normally bought it works fine.
Promo codes both in production and while testing don't seem to be recognised by SwiftyStoreKit.

### What did you expect to happen
I expected to restore the purchase (purchased trough promo code)

### What happened instead
The app found nothing to restore.