[REQUIRED] Describe your environment

• Operating System version: Ubuntu 20.04
• Browser version: Chrome 86
• Firebase SDK version: ^8.1.0
• Firebase Product: firestore

[REQUIRED] Describe the problem

When querying documents from a collection, the field type reference does not return an instance of DocumentReference anymore. Therefore calling e.g. get() will result in an is not a function error. Example code can be found in the link below.

Relevant Code:

https://stackblitz.com/edit/firebase-issue-sandbox-z9mwhw