fix: set TreeItemChildren prop "parentId" correctly

Author: lukasbach

next-release-notes.md

@@ -2,4 +2,9 @@
 
 - Add `setDomFocus` argument to focus-item methods to provide an escape hatch to set the focus state of an item in RCT
   without updating the DOM focus. This defaults to true in all existing methods to maintain the current behavior if
-  it is absent.
+  it is absent.
+
+### Bug Fixes
+
+- Fix a bug where the `parentId` property in the `renderItemsContainer` render method was incorrectly set to the tree id
+  for the root container.

packages/core/src/tree/TreeManager.tsx

@@ -35,7 +35,7 @@ export const TreeManager = (): JSX.Element => {
   const treeChildren = (
     <>
       <MaybeLiveDescription />
-      <TreeItemChildren depth={0} parentId={treeId}>
+      <TreeItemChildren depth={0} parentId={rootItem}>
         {rootChildren ?? []}
       </TreeItemChildren>
       <DragBetweenLine treeId={treeId} />