Specifically `An update to * inside a test was not wrapped in act(...)` is not logged when a prior update threw. 

<details>
<summary>failing test (#21766)</summary>

```js
// @gate __DEV__
it('warns if a setState is called outside of act(...) after a component threw', () => {
  let setValue = null;
  function App({defaultValue}) {
    if (defaultValue === undefined) {
      throw new Error();
    }
    const [value, _setValue] = React.useState(defaultValue);
    setValue = _setValue;
    return value;
  }

  expect(() => {
    act(() => {
      render(<App defaultValue={undefined} />, container);
    });
  }).toThrow();

  act(() => {
    rerender(<App defaultValue={0} />, container);
  });

  expect(() => setValue(1)).toErrorDev([
    'An update to App inside a test was not wrapped in act(...).',
  ]);
});
```
</details>

What I noticed is that in https://github.com/facebook/react/blob/27c9c95e23ddedb9163373950e364dd62038f6c0/packages/react-reconciler/src/ReactFiberWorkLoop.new.js#L2855-L2865
the `executionContext` will still equal `RetryAfterError` when we would expect a "missing act" warning.

"missing act" warnings are working as expected with legacy roots.
}
    case RootSuspended: {
      markRootSuspended(root, lanes);
       
       
      if (
        includesOnlyRetries(lanes) &&
         
        !shouldForceFlushFallbacksInDEV()
      ) {
         
         
        const msUntilTimeout =
          globalMostRecentFallbackTime + FALLBACK_THROTTLE_MS - now();
         
        if (msUntilTimeout > 10) {
          const nextLanes = getNextLanes(root, NoLanes);
          if (nextLanes !== NoLanes) {
             
            break;
          }
          const suspendedLanes = root.suspendedLanes;
          if (!isSubsetOfLanes(suspendedLanes, lanes)) {
             
             
             
             
            const eventTime = requestEventTime();
            markRootPinged(root, suspendedLanes, eventTime);
            break;