Storage `bucket.exists()` always returns false for firebase emulator

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### [REQUIRED] Step 2: Describe your environment

* Operating System version: Ubuntu
* Firebase SDK version: firebase-admin@12.0.0 firebase-tools@13.1.0
* Firebase Product: storage
* Node.js version: 18.16.1
* NPM version: 9.5.1

### [REQUIRED] Step 3: Describe the problem

#### Steps to reproduce:

Create basic project with storage and functions setup for emulation: (functions only used to call storage bucket methods)
```json
// firebase.json
"emulators": {
"functions": {
"port": 5001
},
"storage": {
"port": 9199
},
// ...rest of config
```
Run emulator with `firebase emulators:start --only storage,functions`
Verify storage bucket exists in emulator and the name is matched in firebase config showing `storage_bucket` as the default
Hit the firebase function to run the storage bucket code
Calling `bucket.exists()` from firebase function _always_ returns false.

**Expected outcome:**
Calling `bucket.exists()` from firebase function return `true` when accessing the default bucket.

#### Relevant Code:

```ts
import { onRequest } from 'firebase-functions/v2/https';
import { getStorage } from 'firebase-admin/storage';

export const foo = onRequest(async (req, res) => {
const storage = getStorage();
console.log('APP STORAGE BUCKET:', storage.app.options.storageBucket);

const bucket = storage.bucket();
console.log('DEFAULT STORAGE BUCKET:', `name=${bucket.name}`, `id=${bucket.id}`);

const exists = await bucket.exists();
console.log('BUCKET EXISTS?:', exists);

res.send(`BUCKET EXISTS?: ${exists}`);
});
```

#### Images

Console output:

Emulator Storage: (name of bucket matches id in code)