Batched state changes are not flushed if the promise code changes the DOM (= attaching an iframe). Reproduceable with Safari.

React version: 18.1.0

## Steps To Reproduce

1. Open [codepen](https://codepen.io/kh-viewar/pen/wvpVLxM) with Safari.
2. Click "Upload"
3. => "Spinner" text does not render while Promise is in pending

Link to code example:

https://codepen.io/kh-viewar/pen/wvpVLxM

## The current behavior

State changes are not executed.

## The expected behavior

State should change to true and render spinner component. After promise is resolved (2 seconds timeout), state should switch back to false and spinner component should unmount.

## Original discussion

https://github.com/facebook/react/issues/24365
case ClassComponent: {
          if (!didWarnAboutUpdateInRender) {
            console.error(
              'Cannot update during an existing state transition (such as ' +
                'within `render`). Render methods should be a pure ' +
                'function of props and state.',
            );
            didWarnAboutUpdateInRender = true;
          }
          break;
        }
      }
    }
  }
}
export function restorePendingUpdaters(root: FiberRoot, lanes: Lanes): void {
  if (enableUpdaterTracking) {
    if (isDevToolsPresent) {
      const memoizedUpdaters = root.memoizedUpdaters;
      memoizedUpdaters.forEach(schedulingFiber => {
        addFiberToLanesMap(root, schedulingFiber, lanes);
      });
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    }
  }
}
const fakeActCallbackNode = {};
function scheduleCallback(priorityLevel, callback) {