MIME type ('text/html') not executable after upgrading to v17

Yesterday I upgraded a stable v16 system to v17. The database upgraded without error, however the login box is no longer displayed. The browser console shows the following errors. What do you recommend?

Refused to execute script from ‘https://docs.errcs-registry.com/core/js/dist/main.js?v=4935c968-8’ because its MIME type (‘text/html’) is not executable, and strict MIME type checking is enabled.

Uncaught ReferenceError: OC is not defined
Uncaught ReferenceError: OCA is not defined