Could not reach Cloud Firestore backend after upgrading to v9, but only in some projects

Problem

[REQUIRED] Describe your environment Operating System version: Windows 10 Browser version: Chrome 97 Firebase SDK version: 9.6.5 * Firebase Product: Firestore [REQUIRED] Describe the problem After upgrading to Firebase v9 from v8, I'm encountering the following error in 2 of 4 environments: [code block] Here are the environments and results: GCP Project ID | GCP Firestore Region | After upgrading to v9 -- | -- | -- Firebase Emulator | None (local) | Works fine {project}-dev | us-central | Works fine {project}-prod | us-central | Could not reach Cloud Firestore backend {project}-prod-ca | northamerica-northeast1 | Could not reach Cloud Firestore backend The code in all 4 environments are identical and the CI/CD pipeline for the 3 GCP projects are identical. It's particularly noteworthy that `{project}-dev` works fine while `{project}-prod` and `{project}-prod-ca` don't. Steps to reproduce: To see the results, I created these 2 test pages. They both use SDK v9: {project}-dev: https://student-dev.examind.io/firestore {project}-prod-ca: https://student-ca.examind.io/firestore You will notice that `{project}-dev` loads firestore data just fine, while `{project}-prod-ca` doesn't and outputs this to the console after 10 seconds: There are a couple of related issues (https://github.com/firebase/firebase-js-sdk/issues/5667, https://github.com/firebase/firebase-js-sdk/issues/5932), but seeing different results in different projects with the same codebase may be a