ContactStore.FindContactsAsync() returns Contact objects with no data

Question

Hello! 
I have a problem accessing contacts in my Windows Phone 8.1 application (Universal Store app to be precise).
The app executes the following on a mobile device running windows 8.1:
public async Task Load()
ContactStore store = await ContactManager.RequestStoreAsync();
IReadOnlyList<Contact> allContacts = await store.FindContactsAsync();
foreach (Contact user in allContacts) {
Debug.WriteLine(user.Id); // this is Ok, the rest is empty
Debug.WriteLine(user.FirstName);
Debug.WriteLine(user.MiddleName);
Debug.WriteLine(user.LastName);
Debug.WriteLine(user.DisplayName);
Debug.WriteLine(user.Name);
I get 24 Contact objects in a list, which seems right (I can view 24 contacts in People app), but there is absolutely no data in Contact objects fields except for the Id field. All strings are empty and debugger shows no data whatsoever.
I also tried loading contacts by their ids, up to no avail. Still no data.
Contact u = await ContactsSource.GetContactAsync(user.Id);
What am I doing wrong here?

Answer 1

Looks like it is a problem with Skype contacts (I only had these at first).
After some experimenting I found out that contacts added directly in People app are Ok and Facebook contacts are also Ok, I get data as expected. Not sure what happens with contacts from sim.
Is that a known issue?
-- UPDATE
This is what I gathered by now:
Contacts with DataSuppliers[0] == "Outlook" have correct data (ids, names, phones, emails)
Contacts with DataSuppliers[0] == "Skype" have only Ids and no other data
Contacts with DataSuppliers[0] == "Facebook" have ids and names, but
no phones or emails
Contacts with DataSuppliers[0] == "Twitter" or "LinkedIn" are
not received by calling FindContactsAsync()
And when I try to achieve what I want using ContactPicker:
I do receive phones or emails for "Facebook", "Outlook" and "LinkedIn", but I can not get both at the same time (invoking ContactsPicker with two items in DesiredFieldsWithContactFieldType
throws exception).
I don't have Skype contacts in the list at all (although they are visible in People app), but I do have LinkedIn and Facebook contacts.
I don't receive DataSuppliers for any of the contacts.