Previously working project w/o changes now fails to build due to CORS errors

https://stackblitz.com/edit/angularjs-material-ngupgradelite?file=package.json

This project used to work, but has stopped working in the last couple of months. The CORS issues appear to be on the Stackblitz side.

Duplicate definition of module 'vs/basic-languages/typescript/typescript'
s.defineModule @ loader.js:1176
o @ loader.js:1613
(anonymous) @ typescript.js:7
Access to fetch at 'https://t.staticblitz.com/v6/@angular/upgrade@7.0.2' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
angularjs-material-ngupgradelite?file=package.json:1 Access to fetch at 'https://t.staticblitz.com/v6/@angular/upgrade@7.0.2' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
Access to fetch at 'https://t.staticblitz.com/v6/@types/angular@1.6.51' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
angularjs-material-ngupgradelite?file=package.json:1 Access to fetch at 'https://t.staticblitz.com/v6/@types/angular@1.6.51' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
Access to fetch at 'https://data.jsdelivr.com/v1/package/npm/@types/angular@1.6.51' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
angularjs-material-ngupgradelite?file=package.json:1 Access to fetch at 'https://data.jsdelivr.com/v1/package/npm/@types/angular@1.6.51' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
Access to fetch at 'https://data.jsdelivr.com/v1/package/npm/@angular/upgrade@7.0.2' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
angularjs-material-ngupgradelite?file=package.json:1 Access to fetch at 'https://data.jsdelivr.com/v1/package/npm/@angular/upgrade@7.0.2' from origin 'https://stackblitz.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
engineworker.js:1 Uncaught (in promise) TypeError: Failed to fetch
Promise.then (async)
e.default @ engineworker-28a42a8f47380fbf2140a.js:1
(anonymous) @ engineworker-28a42a8f47380fbf2140a.js:1
dispatch @ engineworker-28a42a8f47380fbf2140a.js:1
(anonymous) @ engineworker-28a42a8f47380fbf2140a.js:1
t.onmessage @ engineworker-28a42a8f47380fbf2140a.js:1

Browser: Chrome Version 70.0.3538.77 (Official Build) (64-bit)

[adamduren]

This is happening for me on my blitz for the package @angular/pwa.

[bob-lee]

All demos are back, thanks