import Firebase no longer works

[REQUIRED] Step 1: Describe your environment

• Xcode version: 12.0 beta 2
• Firebase SDK version: 6.28.1
• Firebase Component: Whole Firebase framework (Auth, Core, Database, Firestore, Messaging, Storage, etc)
• Component version: 6.28.1
• Installation method: CocoaPods (select one)

[REQUIRED] Step 2: Describe the problem

Steps to reproduce:

Just install firebase with some components like functions and firestore, then try to use firestore/functions with imported Firesbase.

What happened? How can we make the problem occur?
This could be a description, log/console output, etc.
After the update, importing Firebase in not enough to use firestore/auth/functions, it looks like import Firebase now do nothing

But after remove import firebase, and add import for each component then it works

That is a planned change or bug?

If you have a downloadable sample project that reproduces the bug you’re reporting, you will
likely receive a faster response on your issue.

Relevant Code:

import Fireabse
let functions = Functions.functions() // this case doesn't work

////
import FirebaseFunctions
let functions = Functions.functions() // this one works

so it looks like the `import Firebase` is useless since new update right?