QUIC Protocol masOS Safari

Hi all. we are experiencing issues with QUIC. New sites are using QUIC and this is stopping inspection and web control. We have fixed the issue with Chrome, but many of our global users use Safari. QUIC is baked into Safari and therefore no option to disable. In the log for Sophos antivirus you can see a log that xx.com has been blocked but no indication on safari. (other browsers has the 'This has been blocked' banner) 

Has anyone has any luck with Sophos cloud endpoint/Safari/QUIC?