Functions Emulator does not read parameter configuration (.env files) correctly

[sceee]

[REQUIRED] Environment info

firebase-tools: 11.17.0

Platform: Windows

[REQUIRED] Test case

• Have an empty .env file:

• Have a .env.default file:

IS_STAGING=false

• Have a .env.staging file:

IS_STAGING=true

• Have .env.local file:

FUNCTIONS_EMULATOR=true

Have the following code in the index.ts that references this parameter's value:

...
initializeApp({
  defineBoolean('IS_STAGING')
    .equals(true)
    .thenElse("stagingbucketname", "prodbucketname")
    .toString(),
})
...

Have some test that calls a Cloud Function.

[REQUIRED] Steps to reproduce

1. Just "start" the Firebase emulator using firebase emulators:start --import=./testdata/emulatordata --project default
   -> The following warning is emitted indicating it could not load the IS_STAGING environment variable from the .env files:

? Enter a boolean value for IS_STAGING:

[REQUIRED] Expected behavior

Is should read the variable from the .env.default file.

[REQUIRED] Actual behavior

It asks for the value of the IS_STAGING environment variable.
On top of that, after entering the value when prompted, it tries to write it to a new file .env.my-project-id instead of the existing .env.default (where default is the alias).

This causes the following output and prevents the emulator from running:

i  functions: Created new local file .env.my-project-id to store param values. We suggest explicitly adding or excluding this file from version control.
!!  functions: Failed to load function definition from source: FirebaseError: Can't have both dotenv files with projectId (env.my-project-id) and projectAlias (.env.default) as extensions.

It should not write any configuration here as the IS_STAGING is already defined in both the .env.default and .env.staging.

Additionally:
If I now rename the .env.default and env.staging files to .env.my-project-id and .env.my-staging-project-id, it still prompts for the value. If I enter it, it fails to start the emulator as the value is already defined (this relates to/duplicates #5219 ):

? Enter a boolean value for IS_STAGING: false
i  functions: Loaded environment variables from .env, .env.my-project-id.
i  functions: Loaded environment variables from .env, .env.my-project-id.
!!  functions: Failed to load function definition from source: FirebaseError: Attempted to write param-defined key IS_STAGING to .env files, but it was already defined.

[aalej]

This seems to be a duplicate of #5314. That said, I'll close this issue now. Thanks.