Is direct linking HTML pages via Iframe being Blocked in Canvas now? 

We've had reports this is now showing errors when attempted, however it was working previously.

Browser console (Firefox) is showing the following:
"Blocked script execution in '<URL>' because the document's frame is sandboxed and the 'allow-scripts' permission is not set."
and
"Refused to frame 'https://sso.canvaslms.com/' because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'self' sso.canvaslms.com sso.staging.canvaslms.com sso.beta.canvaslms.com sso.test.canvaslms.com sso2.canvaslms.com sso2.staging.canvaslms.com sso2.beta.canvaslms.com sso2.test.canvaslms.com a25028-484472.cluster15.canvas-user-content.com".

This was working fine previously but now is showing up an error, even when directly linking a file hosted on Canvas.

Thanks