Sharing a contact with a phone in the Contract application terminates the application

Question

Whenever I try to exchange phone book contacts with the target application using the Contract Agreement in WP 8.1, the target application always exits before calling the ReportCompleted() method.

The contact is retrieved using GetStorageItemsAsync() since it is actually a .VCF file, but before I can direct the user through the stream of the target application, the application terminates! Functionality is great when sharing any other storage item (say, an image).

Whatsapp (2.12.60 on WP 8.1) also shows the same interrupt interrupt behavior when sharing.

Is this a bug in the OS? If not, how can I do this?