Firebase Auth Emulator interferes with Firebase Storage

Start by reading src/main/java/com/google/firebase/auth/internal/Utils.java and src/main/java/com/google/firebase/ImplFirebaseTrampolines.java, especially the FIREBASE_AUTH_EMULATOR_HOST and emulator-credential handling. Reproduce the issue with Auth and Storage enabled together, then verify that Storage calls remain authorized while emulator credentials apply only to Auth; also check whether separate FirebaseApp instances can differ in emulator configuration.

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

• For issues or feature requests related to the code in this repository
  file a Github issue.
  • If this is a feature request make sure the issue title starts with "FR:".
• For general technical questions, post a question on StackOverflow
  with the firebase tag.
• For general Firebase discussion, use the firebase-talk
  google group.
• For help troubleshooting your application that does not fall under one
  of the above categories, reach out to the personalized
  Firebase support channel.

[REQUIRED] Step 2: Describe your environment

• Operating System version: Windows 11
• Firebase SDK version: ____
• Library version: 9.1.1
• Firebase Product: auth, storage

[REQUIRED] Step 3: Describe the problem

We access the Auth and Storage services in our project using this Java Admin SDK.
Recently, we wanted to make use of the Auth Emulator for development purposes. However, after enabling the emulator by setting the FIREBASE_AUTH_EMULATOR_HOST environment variable, the Storage calls stop working and return 401 Unauthorized.

It seems that by setting the FIREBASE_AUTH_EMULATOR_HOST environment variable, the whole project enters an emulator mode and uses emulator credentials. The emulator credentials should be made to only apply to Auth calls.

Furthermore, I could not even find a way to create two instances of FirebaseApps (one with the emulator enabled and one disabled), since the check for FIREBASE_AUTH_EMULATOR_HOST is static and shared program-wide.

Steps to reproduce:

Use Auth and Storage in a production project. Enable FIREBASE_AUTH_EMULATOR_HOST and Storage stops working.