Editor get stuck on Application.Reload when using Listen() on a collection or document reference #845

[REQUIRED] Please fill in the following fields:

• Unity editor version: 2020.1.8f1
• Firebase Unity SDK version: 6.16.0
• Source you installed the SDK: Unity Package Manager
• Problematic Firebase Component: Firestore
• Other Firebase Components in use: Auth, Functions
• Additional SDKs you are using: none
• Platform you are using the Unity editor on: Windows
• Platform you are targeting: Android, iOS
• Scripting Runtime: IL2CPP

[REQUIRED] Please describe the issue here:

When listening for changes on a collection or a document in any part of a script, Editor get stuck on Application.Reload state after recompiling or when entering play mode.

Steps to reproduce:

• Add a document or collection listener with ref.Listen() in any part of a monobehaviour script.
• Return to the Editor and wait for compilation
• Try to enter play mode
• Editor get stuck on Application.Reload state and is unusable.

Appens 100% of the time. If not listener is set, everything is ok.

Relevant Code:

Example class:

using Firebase.Firestore;
using UnityEngine;

public class TestListenFirebase : MonoBehaviour
{
    void Start()
    {
        var db = FirebaseFirestore.DefaultInstance;
        CollectionReference col = db.Collection("users");

        col.Listen(snapshot =>
        {
            Debug.Log("Listening...");
        });
    }
}