### 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_
id = getUID();
    }
     This refinement is for Flow purposes only.
    const refinedID = ((id: any): number);
     Make sure we're tracking this Fiber
     e.g. if it just mounted or an error was logged during initial render.
    if (!fiberToIDMap.has(fiber)) {
      fiberToIDMap.set(fiber, refinedID);
      idToArbitraryFiberMap.set(refinedID, fiber);
    }
     Also make sure we're tracking its alternate,
     e.g. in case this is the first update after mount.
    const {alternate} = fiber;
    if (alternate !== null) {
      if (!fiberToIDMap.has(alternate)) {
        fiberToIDMap.set(alternate, refinedID);
      }
    }
    if (__DEBUG__) {
      if (didGenerateID) {
        debug(
          'getOrGenerateFiberID()',
          fiber,
          fiber.return,
          'Generated a new UID',
        );
      }
    }
    return refinedID;
  }