[Fix]: Data values not formatted when coming from fields plugin custom fields

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unreleased
+
+### Fixed
+
+- Fix an issue where data are not formatted when coming from a field plugin's custom field.
+
 ## [2.15.10] - 2026-08-07
 
 ### Fixed

inc/commoninjectionlib.class.php

@@ -1098,6 +1098,10 @@ private function reformatThirdPass()
                 //Get search option associated with the field
                 $option = self::findSearchOption($searchOptions, $field);
 
+                if ($option && !isset($option['checktype'])) {
+                    $option['checktype'] = $option['datatype'];
+                }
+
                 // Check some types
                 switch ($option['checktype'] ?? 'text') {
                     case "date":