diff --git a/packages/x-tree-view/src/internals/plugins/useTreeViewFocus/useTreeViewFocus.ts b/packages/x-tree-view/src/internals/plugins/useTreeViewFocus/useTreeViewFocus.ts
index 63f51c998778..7f579a85adf9 100644
--- a/packages/x-tree-view/src/internals/plugins/useTreeViewFocus/useTreeViewFocus.ts
+++ b/packages/x-tree-view/src/internals/plugins/useTreeViewFocus/useTreeViewFocus.ts
@@ -7,6 +7,7 @@ import { UseTreeViewFocusSignature } from './useTreeViewFocus.types';
 import { useInstanceEventHandler } from '../../hooks/useInstanceEventHandler';
 import { getActiveElement } from '../../utils/utils';
 import { getFirstNavigableItem } from '../../utils/tree';
+import { MuiCancellableEvent } from '../../models/MuiCancellableEvent';
 
 const useTabbableItemId = (
   instance: TreeViewUsedInstance<UseTreeViewFocusSignature>,
@@ -128,9 +129,14 @@ export const useTreeViewFocus: TreeViewPlugin<UseTreeViewFocusSignature> = ({
     }
   });
 
-  const createHandleFocus =
-    (otherHandlers: EventHandlers) => (event: React.FocusEvent<HTMLUListElement>) => {
+  const createRootHandleFocus =
+    (otherHandlers: EventHandlers) =>
+    (event: React.FocusEvent<HTMLUListElement> & MuiCancellableEvent) => {
       otherHandlers.onFocus?.(event);
+      if (event.defaultMuiPrevented) {
+        return;
+      }
+
       // if the event bubbled (which is React specific) we don't want to steal focus
       if (event.target === event.currentTarget) {
         instance.focusDefaultItem(event);
@@ -144,7 +150,7 @@ export const useTreeViewFocus: TreeViewPlugin<UseTreeViewFocusSignature> = ({
 
   return {
     getRootProps: (otherHandlers) => ({
-      onFocus: createHandleFocus(otherHandlers),
+      onFocus: createRootHandleFocus(otherHandlers),
       'aria-activedescendant': activeDescendant ?? undefined,
     }),
     publicAPI: {
diff --git a/packages/x-tree-view/src/internals/plugins/useTreeViewJSXItems/useTreeViewJSXItems.tsx b/packages/x-tree-view/src/internals/plugins/useTreeViewJSXItems/useTreeViewJSXItems.tsx
index 5b2775a94cfc..e28b703fbed8 100644
--- a/packages/x-tree-view/src/internals/plugins/useTreeViewJSXItems/useTreeViewJSXItems.tsx
+++ b/packages/x-tree-view/src/internals/plugins/useTreeViewJSXItems/useTreeViewJSXItems.tsx
@@ -110,6 +110,13 @@ export const useTreeViewJSXItems: TreeViewPlugin<UseTreeViewJSXItemsSignature> =
   };
 };
 
+const isItemExpandable = (reactChildren: React.ReactNode) => {
+  if (Array.isArray(reactChildren)) {
+    return reactChildren.length > 0 && reactChildren.some(isItemExpandable);
+  }
+  return Boolean(reactChildren);
+};
+
 const useTreeViewJSXItemsItemPlugin: TreeViewItemPlugin<TreeItemProps | TreeItem2Props> = ({
   props,
   rootRef,
@@ -130,15 +137,7 @@ const useTreeViewJSXItemsItemPlugin: TreeViewItemPlugin<TreeItemProps | TreeItem
   }
   const { registerChild, unregisterChild, parentId } = parentContext;
 
-  const isExpandable = (reactChildren: React.ReactNode) => {
-    if (Array.isArray(reactChildren)) {
-      return reactChildren.length > 0 && reactChildren.some(isExpandable);
-    }
-    return Boolean(reactChildren);
-  };
-
-  const expandable = isExpandable(children);
-
+  const expandable = isItemExpandable(children);
   const pluginContentRef = React.useRef<HTMLDivElement>(null);
   const handleContentRef = useForkRef(pluginContentRef, contentRef);
 
diff --git a/packages/x-tree-view/src/useTreeItem2/useTreeItem2.ts b/packages/x-tree-view/src/useTreeItem2/useTreeItem2.ts
index b2c5ebbe8992..fe2dc1e70f76 100644
--- a/packages/x-tree-view/src/useTreeItem2/useTreeItem2.ts
+++ b/packages/x-tree-view/src/useTreeItem2/useTreeItem2.ts
@@ -37,7 +37,6 @@ export const useTreeItem2 = <TPlugins extends DefaultTreeViewPlugins = DefaultTr
     (otherHandlers: EventHandlers) =>
     (event: React.FocusEvent<HTMLElement> & MuiCancellableEvent) => {
       otherHandlers.onFocus?.(event);
-
       if (event.defaultMuiPrevented) {
         return;
       }
@@ -52,7 +51,6 @@ export const useTreeItem2 = <TPlugins extends DefaultTreeViewPlugins = DefaultTr
     (otherHandlers: EventHandlers) =>
     (event: React.FocusEvent<HTMLElement> & MuiCancellableEvent) => {
       otherHandlers.onBlur?.(event);
-
       if (event.defaultMuiPrevented) {
         return;
       }
@@ -64,7 +62,6 @@ export const useTreeItem2 = <TPlugins extends DefaultTreeViewPlugins = DefaultTr
     (otherHandlers: EventHandlers) =>
     (event: React.KeyboardEvent<HTMLElement> & MuiCancellableEvent) => {
       otherHandlers.onKeyDown?.(event);
-
       if (event.defaultMuiPrevented) {
         return;
       }
@@ -75,7 +72,6 @@ export const useTreeItem2 = <TPlugins extends DefaultTreeViewPlugins = DefaultTr
   const createContentHandleClick =
     (otherHandlers: EventHandlers) => (event: React.MouseEvent & MuiCancellableEvent) => {
       otherHandlers.onClick?.(event);
-
       if (event.defaultMuiPrevented) {
         return;
       }
@@ -87,7 +83,6 @@ export const useTreeItem2 = <TPlugins extends DefaultTreeViewPlugins = DefaultTr
   const createContentHandleMouseDown =
     (otherHandlers: EventHandlers) => (event: React.MouseEvent & MuiCancellableEvent) => {
       otherHandlers.onMouseDown?.(event);
-
       if (event.defaultMuiPrevented) {
         return;
       }