[REQUIRED] Describe your environment

Firebase hosting
Node v14.15.1

[REQUIRED] Describe the problem

A simple batch write, like that shown in your online example below will hang, no error message.

Our app was working fine in all versions prior to installing 8.6.2

Steps to reproduce:

Relevant Code:

// Get a new write batch
var batch = firebase.firestore().batch();

// Set the value of 'NYC'
var nycRef = firebase.firestore().collection("cities").doc("NYC");
batch.set(nycRef, {name: "New York City"});



// Commit the batch
batch.commit().then(() => {
    // ...
});