### Website or app

https://codesandbox.io/s/react-playground-forked-j4niq

### Repro steps

Emoji seem supported but produce strange symbole

![image](https://user-images.githubusercontent.com/24865815/133793744-55a55582-90ad-425f-8a40-4c061a3c1d80.png)

To test emoji on Window Os, use `[win]+[.]` 🟩


### How often does this bug happen?

Every time

### DevTools package (automated)

_No response_

### DevTools version (automated)

_No response_

### Error message (automated)

_No response_

### Error call stack (automated)

_No response_

### Error component stack (automated)

_No response_

### GitHub query string (automated)

_No response_
}
    }
    const message = format(...args);
    if (__DEBUG__) {
      debug('onErrorOrWarning', fiber, null, `${type}: "${message}"`);
    }
    
    fibersWithChangedErrorOrWarningCounts.add(fiber);
    
    const fiberMap =
      type === 'error' ? pendingFiberToErrorsMap : pendingFiberToWarningsMap;
    const messageMap = fiberMap.get(fiber);
    if (messageMap != null) {
      const count = messageMap.get(message) || 0;
      messageMap.set(message, count + 1);
    } else {
      fiberMap.set(fiber, new Map([[message, 1]]));
    }
    
    
    
    
    
    
    flushPendingErrorsAndWarningsAfterDelay();
  }