fix(setNodes): use correct index when using setNodes for inserting #4455

examples/react/src/examples/ReconnectEdge/CustomNode.tsx

@@ -0,0 +1,14 @@
+import { memo } from 'react';
+import { Handle, Position } from '@xyflow/react';
+
+const styles = { padding: '10px', background: 'green' };
+
+const CustomNode = ({ data }) => (
+  <>
+    <div style={styles}>{data.label}</div>
+    <Handle type="source" position={Position.Top} id="a" />
+    <Handle type="source" position={Position.Bottom} id="b" />
+  </>
+);
+
+export default memo(CustomNode);