FirebaseAppCheck.getAppCheckToken(true) does not appear to force refresh all the time?

### [READ] Step 1: Are you in the right place?

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If you have a general question, need help debugging, or fall into some
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* For general technical questions, post a question on [StackOverflow](http://stackoverflow.com/)
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### [REQUIRED] Step 2: Describe your environment

* Android Studio version: 7.0.2
* Firebase Component: AppCheck
* Component version: from BoM 28.4.0

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

#### Steps to reproduce:

If you call these two methods back to back the tokens are equal in certain cases. Is that expected? Shouldn't force refreshing the token *always* get a new token? :thinking:

pseudo-code:
```
token1 = FirebaseAppCheck.getAppCheckToken();`
token2 = FirebaseAppCheck.getAppCheckToken(true);

// sometimes token1 == token2?
// But then if you wait 5 seconds and re-try both back to back you will get token1 != token2
```

#### Relevant Code:

We test this case here, [you can run it ](https://github.com/invertase/react-native-firebase/blob/master/tests/README.md)

https://github.com/invertase/react-native-firebase/blob/90b4d7021aff7d5d28140b57eb69283b04712257/packages/app-check/e2e/appcheck.e2e.js#L54-L65

The (boring, by the book) Java code it exercises is:

https://github.com/invertase/react-native-firebase/blob/90b4d7021aff7d5d28140b57eb69283b04712257/packages/app-check/android/src/main/java/io/invertase/firebase/appcheck/ReactNativeFirebaseAppCheckModule.java#L73-L95

This same test found an actual crash in the firebase-ios-sdk which was just resolved https://github.com/firebase/firebase-ios-sdk/issues/8544 - so perhaps this is just an unexpected (though still valid) use case?

Or perhaps my expectations of the API are incorrect?

Any insight appreciated - thanks!