Fix(core): revert breaking change (#934)

* Fix(core): revert bug introduced by phpstan refactor

* adapt changelog

Author: stonebuzz

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [UNRELEASE]
 
+### Fixed
+
+- Fix of GLPI native fields update for objects with `fields` containers.
+
 ## [1.21.20] - 2025-03-20
 
 ### Fixed

inc/container.class.php

@@ -1716,9 +1716,7 @@ public static function preItem(CommonDBTM $item)
             $entities = getSonsOf(getTableForItemType('Entity'), $loc_c->fields['entities_id']);
         }
 
-        //workaround: when a ticket is created from readdonly profile,
-        //it is not initialized; see https://github.com/glpi-project/glpi/issues/1438
-        if (!empty($item->fields)) {
+        if (count($item->fields) === 0) {
             $item->fields = $item->input;
         }