Or rather the Chrome browser due to the “HTTPS-only” option being “forced” and/or enabled “by default”, recently 
May I ask have you tried using a different Web browser, or tried clearing your Web browser cache?
How about using a Private window (Incognito mode) or a VPN connection if possible?
Is it the same behaviour on your mobile phone (4G LTE, mobile data, cellular)?
It opens on HTTP for me, Cloudflare proxied.
It opens on HTTP for me, not proxied.
I got the Connection timeout 522 error.
May I ask if you are using Page Rules to achieve this, or?
The “Always Use HTTPS” and the “Automatic HTTP Rewrites” options both are disabled at CF dashboard?