title: Flutter InAppPurchase products not showing on release build
body: <p>I've added the <code>in_app_purchase</code> flutter package and was working fine on debug (followed the setup instructions etc.) but when I build the release apk it cannot find any of the products, all are returned under <code>notFoundIDs</code> without stating any error.</p>
  
  <p>I've tried <code>flutter clean</code>.
  Also Tried using the exact same <code>buildTypes</code> config on both, same result.</p>
  
  <p>Any idea why the release build would not return any queried items? Thanks.</p>