All SPFx web parts fail to load - Public CDN issues

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

None

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• Edge Version 146.0.3856.62
• Firefox
• Chrome

Describe the bug / error

On a single tenant (so far) - we're seeing NO SPFx web parts loading at all, instead rendering a [object Object] error

I'm seeing CORS errors from the the public-cdn.sharepoint.com - client reports they've seen it for the past few days,

The network request looks like this

GET https://public-cdn.sharepointonline.com/<TENANT>.sharepoint.com/sites/apps/ClientSideAssets/59903278-dd5d-4e9e-bef6-562aae716b8b/modern-search-box-web-part_f7cae02a60fdd9184eb5.js

Stripping the CDN and trying

GET https://<TENANT>.sharepoint.com/sites/apps/ClientSideAssets/59903278-dd5d-4e9e-bef6-562aae716b8b/modern-search-box-web-part_f7cae02a60fdd9184eb5.js

Works just fine, initial thought was that it was related to MC1184996 but as we're seeing ...public-cdn.sharepointonline.... and not ...publiccdn.sharepointonline... I'm pretty sure it's unrelated.

Public CDN is (and was) enabled:

Steps to reproduce

No clue, be on an unfortunate tenant I guess, tenant is set to "Standard Release" and Data Location is "European Union\EFTA"

Expected behavior

Web parts should load 🤷

Start with the public-cdn.sharepointonline.com network request and its CORS error, then compare it with the direct tenant SharePoint URL shown in the report. Check whether the affected tenant and CDN configuration can reproduce the failure across Edge, Chrome, and Firefox. Done means SPFx web parts load normally through the public CDN; the issue names no repository files or tests.