### 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_
1. Component type is updated and Fast Refresh schedules an update+remount.
     2. flushPendingErrorsAndWarningsAfterDelay() runs, sees the old Fiber is no longer mounted
        (it's been disconnected by Fast Refresh), and calls untrackFiberID() to clear it from the Map.
     3. React flushes pending passive effects before it runs the next render,
        which logs an error or warning, which causes a new ID to be generated for this Fiber.
     4. DevTools now tries to unmount the old Component with the new ID.
    
     The underlying problem here is the premature clearing of the Fiber ID,
     but DevTools has no way to detect that a given Fiber has been scheduled for Fast Refresh.
     (The "_debugNeedsRemount" flag won't necessarily be set.)
    
     The best we can do is to delay untracking by a small amount,
     and give React time to process the Fast Refresh delay.
    untrackFibersSet.add(fiber);
     React may detach alternate pointers during unmount;
     Since our untracking code is async, we should explicily track the pending alternate here as well.
    const alternate = fiber.alternate;
    if (alternate !== null) {
      untrackFibersSet.add(alternate);
    }
    if (untrackFibersTimeoutID === null) {
      untrackFibersTimeoutID = setTimeout(untrackFibers, 1000);
    }
  }
  const untrackFibersSet: Set<Fiber> = new Set();
  let untrackFibersTimeoutID: TimeoutID | null = null;
  function untrackFibers() {
    if (untrackFibersTimeoutID !== null) {
      clearTimeout(untrackFibersTimeoutID);
      untrackFibersTimeoutID = null;