Functional `ref` prop throws a `Maximum update depth exceeded` error when suspending.

React version: `18.0.0-alpha-464f27572-20210713`

## Steps To Reproduce

1. Click on the `suspend` button: https://codesandbox.io/s/ref-set-too-many-times-jm0c3?file=/src/App.js.

## The current behavior

Clicking on the `suspend` button throws a `Maximum update depth exceeded` error.

## The expected behavior

Clicking on the `suspend` button suspends.
}
function commitNestedUnmounts(
  finishedRoot: FiberRoot,
  root: Fiber,
  nearestMountedAncestor: Fiber,
): void {
  
  
  
  
  
  let node: Fiber = root;
  while (true) {
    commitUnmount(finishedRoot, node, nearestMountedAncestor);
    
    
    if (
      node.child !== null &&
      
      
      (!supportsMutation || node.tag !== HostPortal)
    ) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    if (node === root) {
      return;
    }
    while (node.sibling === null) {