Webform entity reference node view : multiple occurrences within 1 node

Spinning this new issue off from https://www.drupal.org/node/2656246 which has been already closed.

For starters : congrats with the entity reference views enhancement, making sitebuilder's lifes easier to cope with common business requirements.

For my current assignment, i was looking to use the latest dev branch for the following use case :
1. content type job_event, holding a multiple occurrences text field, named workshops.
2. same content type, holding an entity reference to a subscription webform
3. job_event node display (eg. /node/3347) embeds the webform
4. A webform component "Preferred workshops" allows subscribers to select 1 or more workshops, in checkbox modus.
5. This component is configured to use a custom entityreference view (see screenshot 1 with 5 results)
6. This view is using a contextual filter on content:nid, by configuration provided in the webform component settings as [current-page:url:unaliased:args:value:1]

The result of this setup only shows the last of 5 present workshops (see screenshot-2)

Digging into this module's code, i found out that the narrowing is somehow caused by $view->display_handler->set_option('entityreference_options', $entityreference_options); inside :

function webform_references_execute_view() {
  ...
 $view->set_display($display_name);
  // Make sure the query is not cached.
  $view->is_cacheable = FALSE;
  // Set the options for the display handler.
  $entityreference_options = array(
    'match' => $match,
    'match_operator' => $match_operator,
    'limit' => $limit,
    'ids' => $ids,
  );
  $view->display_handler->set_option('entityreference_options', $entityreference_options);
  $result = $view->execute_display($display_name, $args); 
  return $result;
  ...
}

Leaving this dispay_handler setting out does return the five workshop elements, but not in the expected array format (see screenshot 3).

I have no experience in using entityreference_options in code for display handling, so i could appreciate some assistance in making this use case to work.