diff --git a/tools/devtools/src/devtools_app/devtools_window/components_tab/details_window/object_tree_element/object_tree_element.xml b/tools/devtools/src/devtools_app/devtools_window/components_tab/details_window/object_tree_element/object_tree_element.xml
index 0925b957..3f8e8a83 100644
--- a/tools/devtools/src/devtools_app/devtools_window/components_tab/details_window/object_tree_element/object_tree_element.xml
+++ b/tools/devtools/src/devtools_app/devtools_window/components_tab/details_window/object_tree_element/object_tree_element.xml
@@ -38,8 +38,8 @@
         </t>
       </ul>
     </div>
-    <t t-if="props.object.toggled">
-      <t t-foreach="props.object.children" t-as="child" t-key="child.name">
+    <t t-if="props.object.toggled" t-key="contextMenuId">
+      <t t-foreach="props.object.children" t-as="child" t-key="child_index">
         <ObjectTreeElement t-if="props.object.objectType === 'subscription'" object="child" keys="props.keys"/>
         <ObjectTreeElement t-else="" object="child"/>
       </t>
diff --git a/tools/devtools/src/page_scripts/owl_devtools_global_hook.js b/tools/devtools/src/page_scripts/owl_devtools_global_hook.js
index fb9a2cd1..787760d8 100644
--- a/tools/devtools/src/page_scripts/owl_devtools_global_hook.js
+++ b/tools/devtools/src/page_scripts/owl_devtools_global_hook.js
@@ -1012,19 +1012,6 @@
             children.push(entries);
             index++;
           }
-          const size = this.serializeObjectChild(
-            obj,
-            { type: "item", value: "size", childIndex: children.length },
-            depth,
-            objType,
-            path,
-            oldBranch.children[index],
-            oldTree
-          );
-          if (size) {
-            children.push(size);
-            index++;
-          }
           Reflect.ownKeys(obj).forEach((key) => {
             const child = this.serializeObjectChild(
               obj,