On first save, field_get_items() does not work in hook_field_collection_presave() or hook_entity_presave()

It appears that field_get_items() will always return FALSE if used in hook_field_collection_presave() when saving a new field collection item. It does work on subsequent saves. It does not work in hook_entity_presave() either.

To test, save a new host node with a non-empty field collection item and check the output of this.

function MYMODULE_field_collection_item_presave(FieldCollectionItemEntity $field_collection_item) {
  if ($field_collection_item->field_name == MY_FIELD_COLLECTION_NAME) {
    print '<pre>' . __FUNCTION__ . PHP_EOL;
    // field_get_items() does not work here.
    print_r(field_get_items('field_collection_item', $field_collection_item, MY_COLLECTION_FIELD_NAME));
  }
}

function MYMODULE_entity_presave($entity, $type) {
  print __FUNCTION__ . "($type)" . PHP_EOL;
  if ($type == 'field_collection_item' && $entity->field_name == MY_FIELD_COLLECTION_NAME) {
    // field_get_items() does not work here.
    print_r(field_get_items('field_collection_item', $entity, MY_COLLECTION_FIELD_NAME));
  }
  elseif ($type == 'node' && $entity->type == MY_NODE_TYPE) {
    // but field_get_items() works here for nodes.
    print_r(field_get_items('node', $entity, MY_NODE_FIELD_NAME));
    print '</pre>';
    die;
  }
}

field_get_items() only works on first save for the node, not for the field collection. Preliminary digging suggests this is because field_language() fails to return a language code for the field.