From 934a0c9868b7ec920af7d298e4a7e74d5b961785 Mon Sep 17 00:00:00 2001
From: Lukas Maurer <lukas.maurer@siemens.com>
Date: Thu, 20 Aug 2026 13:58:41 +0200
Subject: [PATCH 1/2] fix(react): correct tree expanded event type

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .changeset/fix-react-tree-expanded.md     | 5 +++++
 packages/react/src/tree/internal-tree.tsx | 2 +-
 packages/react/src/tree/tree.tsx          | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/fix-react-tree-expanded.md

diff --git a/.changeset/fix-react-tree-expanded.md b/.changeset/fix-react-tree-expanded.md
new file mode 100644
index 00000000000..585d25e501b
--- /dev/null
+++ b/.changeset/fix-react-tree-expanded.md
@@ -0,0 +1,5 @@
+---
+'@siemens/ix-react': patch
+---
+
+Fix the `onNodeToggled` event payload type to expose `isExpanded` with the correct spelling.
diff --git a/packages/react/src/tree/internal-tree.tsx b/packages/react/src/tree/internal-tree.tsx
index d43746111b3..3991debb1ff 100644
--- a/packages/react/src/tree/internal-tree.tsx
+++ b/packages/react/src/tree/internal-tree.tsx
@@ -24,7 +24,7 @@ import React from 'react';
 
 type IxTreeEvents = {
   onContextChange: EventName<IxTreeCustomEvent<TreeContext>>;
-  onNodeToggled: EventName<CustomEvent<{ id: string; isExpaned: boolean }>>;
+  onNodeToggled: EventName<CustomEvent<{ id: string; isExpanded: boolean }>>;
   onNodeClicked: EventName<CustomEvent<string>>;
   onNodeRemoved: EventName<CustomEvent<any>>;
 };
diff --git a/packages/react/src/tree/tree.tsx b/packages/react/src/tree/tree.tsx
index 96cfd3aeede..10ee00766f9 100644
--- a/packages/react/src/tree/tree.tsx
+++ b/packages/react/src/tree/tree.tsx
@@ -25,7 +25,7 @@ export type IxTreeProps = Omit<
   renderItem?: (data: any) => React.ReactNode;
   onContextChange?: (event: IxTreeCustomEvent<TreeContext>) => void;
   onNodeToggled?: (
-    event: CustomEvent<{ id: string; isExpaned: boolean }>
+    event: CustomEvent<{ id: string; isExpanded: boolean }>
   ) => void;
   onNodeClicked?: (event: CustomEvent<string>) => void;
   onNodeRemoved?: (event: CustomEvent<any>) => void;

From 1d28f608d4b64d5c4c72ce4d0ad7172b9950a93a Mon Sep 17 00:00:00 2001
From: Lukas Maurer <lukas.maurer@siemens.com>
Date: Thu, 20 Aug 2026 14:06:39 +0200
Subject: [PATCH 2/2] docs(changeset): mark tree event type fix as breaking

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .changeset/fix-react-tree-expanded.md | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/.changeset/fix-react-tree-expanded.md b/.changeset/fix-react-tree-expanded.md
index 585d25e501b..be2c997d82a 100644
--- a/.changeset/fix-react-tree-expanded.md
+++ b/.changeset/fix-react-tree-expanded.md
@@ -1,5 +1,8 @@
 ---
-'@siemens/ix-react': patch
+'@siemens/ix-react': major
 ---
 
-Fix the `onNodeToggled` event payload type to expose `isExpanded` with the correct spelling.
+Correct the `onNodeToggled` event payload type by renaming `isExpaned` to `isExpanded`.
+
+Update event handlers to access `event.detail.isExpanded` instead of
+`event.detail.isExpaned`.