@Kalenchai It seems that the “tinyURL.com” site is now accessible without the Cloudflare challenge, so that seems to have been a temporary issue. However, now I encountered another, different website that is presenting the Cloudflare challenge and Opera is not able to get past it (while other browsers can).
That website is: Unite4Freedom.com (and it used to work fine without any additional challenge). Do you find the same issue if you try to access it?
I let the Opera team know about this.