Resolved ERROR: Sp PageBuilder Admin ~ Refused to execute script from 'https://[url]/page-not-found' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled.

In the backend, when editing a page in SP PageBuilder, the inspector reports the following (this is the first error listed, among other errors)...
"Refused to execute script from 'https://[url]/page-not-found' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled."

I do not know why the 'page-not-found' reference appears, however, the 'Page Not Found' is a Menu Item that points to an SP PageBuilder page.

Can anyone advise if this is a SP PageBuilder 3.6.10 issue or Joomla 3.9.16 issue?

Thanks,
Geoff