Iframe error, can't edit page

I have the weirdest issue on a page that I inherited. the problem is that if i access the page from within cornerstone, it just doesn’t open and throw and error. however if i go to the front-end and try to edit the same page it has bigger chances of showing normally.

Hello @franticape,

Thanks for writing to us.

I checked your site on my end, and it is working fine. I tested it in Google Chrome version 149.0.7827.201. The issue may be related to the browser cache. I would suggest clearing your browser cache and checking it again. I would also suggest resetting the permalink structure to Plain and then changing it back to Post Name.

Thanks