properly assign dataset in the second prefetch call (#4358)
properly assign dataset in the second prefetch call (#4358)


alexgorban/models,tombstone/models,derekjchow/models,cshallue/models,alexgorban/models,tombstone/models,tombstone/models,derekjchow/models,alexgorban/models,cshallue/models,cshallue/models,derekjchow/models,alexgorban/models,cshallue/models,derekjchow/models,cshallue/models,derekjchow/models,tombstone/models,tombstone/models,alexgorban/models,tombstone/models