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.
ReactCurrentActQueue.disableActWarning === false
    ) {
      const previousFiber = ReactCurrentFiberCurrent;
      try {
        setCurrentDebugFiberInDEV(fiber);
        console.error(
          'An update to %s inside a test was not wrapped in act(...).\n\n' +
            'When testing, code that causes React state updates should be ' +
            'wrapped into act(...):\n\n' +
            'act(() => {\n' +
            '  /* fire events that update state */\n' +
            '});\n' +
            '/* assert on the output */\n\n' +
            "This ensures that you're testing the behavior the user would see " +
            'in the browser.' +
            ' Learn more at https:reactjs.org/link/wrap-tests-with-act',
          getComponentNameFromFiber(fiber),
        );
      } finally {
        if (previousFiber) {
          setCurrentDebugFiberInDEV(fiber);
        } else {
          resetCurrentDebugFiberInDEV();
        }
      }
    }
  }
}
export const warnIfNotCurrentlyActingUpdatesInDev = warnIfNotCurrentlyActingUpdatesInDEV;