Steps to reproduce:
I am not sure why this warning is popping up in the first place (probably another bug of some sort, which I will report as well) as the website does indeed have a valid certificate and uses HTTPS, and everything worked fine after a reload. However, when on this page, clicking on the "view the certificate" hyperlink did not display the Certificate.
The certificate details should be displayed
Orion, OS version; hardware type:
Version 0.99.121-beta (WebKit 614.1.20)
MacBook Pro (macOS Ventura 13.0 build 22A380)
(I am clickin on the link in the below video)
I am able to view certificate details ok if I click on the padlock icon on some other securely loaded site.