Entityreference autocomplete with search fields uses wrong column name

When creating an autocomplete reference, and using drupal fields as 'search fields' in the settings for "Entity reference list" results in a 500 error on the ajax call.

Steps to reproduce

Add a new plain text field to the user profile: "firstname"
Add a user reference field to the article content type.
Create a views "Entity refrernce display" on the users base table. Add the firstname as a field, and enable it as a 'search field' in the settings for "Entity reference list".
Modify the user reference to use the entity reference view as "Reference method"
Create a new article node, and try to fill in the user reference

The same bug occurs when referencing content instead of users.

Logs

The following error is shown in the logs:

Drupal\Core\Database\DatabaseExceptionWrapper: Exception in User reference[user_reference]: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'user__field_firstname.field_firstname' in 'field list': SELECT users_field_data.uid AS uid, users_field_data.name AS users_field_data_name, user__field_firstname.field_firstname AS user__field_firstname_field_firstname FROM {users_field_data} users_field_data LEFT JOIN {user__field_firstname} user__field_firstname ON users_field_data.uid = user__field_firstname.entity_id AND (user__field_firstname.deleted = :views_join_condition_0 AND user__field_firstname.langcode = users_field_data.langcode) WHERE ((( (users_field_data.name LIKE :db_condition_placeholder_2 ESCAPE '\\') OR (user__field_firstname.field_firstname LIKE :db_condition_placeholder_3 ESCAPE '\\') ))AND(( (users_field_data.status <> :db_condition_placeholder_4) ))) LIMIT 10 OFFSET 0; Array ( [:db_condition_placeholder_2] => %jan% [:db_condition_placeholder_3] => %jan% [:db_condition_placeholder_4] => 0 [:views_join_condition_0] => 0 ) in Drupal\views\Plugin\views\query\Sql->execute() (line 1457 of /var/www/eight/core/modules/views/src/Plugin/views/query/Sql.php).

The column that should be used is user__field_firstname_value
Looks like the code in \Drupal\views\Plugin\views\display\EntityReference does not contain the correct column name

// Build the condition using the selected search fields.
      foreach ($style_options['options']['search_fields'] as $field_id) {
        if (!empty($field_id)) {
          // Get the table and field names for the checked field.
          $field_alias = $this->view->query->addField($this->view->field[$field_id]->table, $field_id);
          $field = $this->view->query->fields[$field_alias];
          // Add an OR condition for the field.
          $conditions->condition($field['table'] . '.' . $field['field'], $value, 'LIKE');
        }
      }