### 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_
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      pendingUnmountedRootID = id;
    } else if (!shouldFilterFiber(fiber)) {
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      if (isSimulated) {
        pendingSimulatedUnmountedIDs.push(id);
      } else {
        pendingRealUnmountedIDs.push(id);
      }
    }
    if (!fiber._debugNeedsRemount) {
      untrackFiberID(fiber);
      const isProfilingSupported = fiber.hasOwnProperty('treeBaseDuration');
      if (isProfilingSupported) {
        idToRootMap.delete(id);
        idToTreeBaseDurationMap.delete(id);
      }
    }
  }
  function mountFiberRecursively(
    firstChild: Fiber,
    parentFiber: Fiber | null,
    traverseSiblings: boolean,
    traceNearestHostComponentUpdate: boolean,
  ) {
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    let fiber: Fiber | null = firstChild;