fix: Node leak in refFindNode

CHANGELOG.md

@@ -36,6 +36,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Fix `forceUpdate` to get synced updates in React's Concurrent mode @layershifter ([#2268](https://github.com/microsoft/fluent-ui-react/pull/2268))
 - Fix element reference memory leaks @jurokapsiar ([#2270](https://github.com/microsoft/fluent-ui-react/pull/2270))
 - Adding actionable items into `Carousel` @kolaps33 ([#2271](https://github.com/microsoft/fluent-ui-react/pull/2271))
+- Fix element leak in `refFindNode` @miroslavstastny ([#2288](https://github.com/microsoft/fluent-ui-react/pull/2288))
 
 ### Features
 - Allow `useRef` hook used for storing debugging data to be defined in any order with other hooks in functional components @layershifter, @mnajdova ([#2236](https://github.com/microsoft/fluent-ui-react/pull/2236))

packages/react-component-ref/src/RefFindNode.tsx

@@ -40,6 +40,8 @@ export default class RefFindNode extends React.Component<RefProps> {
 
   componentWillUnmount() {
     handleRef(this.props.innerRef, null)
+
+    delete this.prevNode
   }
 
   render() {