Cannot set tenantId back to null after setting it to something else

[Rexios80]

[REQUIRED] Step 2: Describe your environment

• Android Studio version: VSCode (Flutter development)
• Firebase Component: Auth
• Component version: Whatever flutterfire is using

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

Set tenantId to something. Attempt to set it back to null.

Relevant Code:

auth.setTenantId(null);

Details

flutterfire issue: https://github.com/FirebaseExtended/flutterfire/issues/7896#issue-1107115648