diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92a7402..b5edba0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 
 - Fix uninstall/replace actions processing items without checking item type or user rights on the item
+- Fix group assignment when applying uninstall templates on assignable items
 
 ## [2.10.4] - 2026-08-04
 
diff --git a/inc/uninstall.class.php b/inc/uninstall.class.php
index 2757eb0..ba6f34c 100644
--- a/inc/uninstall.class.php
+++ b/inc/uninstall.class.php
@@ -29,6 +29,7 @@
  */
 
 use Glpi\Asset\Asset_PeripheralAsset;
+use Glpi\Features\AssignableItemInterface;
 
 use function Safe\preg_grep;
 
@@ -215,7 +216,10 @@ private static function doOneUninstall(PluginUninstallModel $model, Transfer $tr
             }
         }
 
-        if ($item->isField('groups_id')) {
+        if (
+            $item->isField('groups_id')
+            || ($item instanceof AssignableItemInterface)
+        ) {
             $nbgroup = countElementsInTableForEntity(
                 "glpi_groups",
                 $entity,
@@ -226,7 +230,10 @@ private static function doOneUninstall(PluginUninstallModel $model, Transfer $tr
                 && ($nbgroup == 1 || $model->fields["groups_id"] == 0)
             ) {
                 // If a new group is defined and if the group is accessible in the object's entity
-                $fields["groups_id"] = $model->fields["groups_id"];
+                // Assignable items store the group in `glpi_groups_items`, so `groups_id` must be an array (0 is filtered out, clearing the group)
+                $fields["groups_id"] = $item instanceof AssignableItemInterface
+                    ? [$model->fields["groups_id"]]
+                    : $model->fields["groups_id"];
             }
         }