fix(searchoption): default value not displayed when field is not set (#985)

* fix(searchoption): default value not displayed when field is not set

* CHANGELOG.md

* Update inc/abstractcontainerinstance.class.php

Co-authored-by: Romain B. <8530352+Rom1-B@users.noreply.github.com>

* fix lint

---------

Co-authored-by: Romain B. <8530352+Rom1-B@users.noreply.github.com>

Author: MyvTsv

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [UNRELEASE]
 
 - Fix incompatibility of `multiple` dropdowns with `massiveaction`
+- Fix default value properly applied in multiple dropdown search options
 
 ## [1.21.22] - 2025-05-28
 

inc/abstractcontainerinstance.class.php

@@ -159,7 +159,11 @@ public static function getSpecificValueToDisplay($field, $values, array $options
             ) {
                 $itemtype = PluginFieldsDropdown::getClassname($field_specs->fields['name']);
                 if (empty($values[$field])) {
-                    return ''; // Value not defined
+                    if (!empty($field_specs->fields["default_value"])) {
+                        $values[$field] = $field_specs->fields['default_value'];
+                    } else {
+                        return ''; // Value not defined
+                    }
                 }
                 $values = json_decode($values[$field]);
                 if (!is_array($values)) {