Cloudflare Pages serving TLS1.0 and TLS1.1

I have a Cloudflare Pages site which is serving pages with TLS1.0/1.1, despite trying to set TLS1.2 as the minimum TLS version.

In DNS, the CNAMEs that point to Cloudflare Pages are proxied.
In the Security settings, the minimum TLS version is set to TLS1.2.
I can’t find any security settings in CF Pages.

Prior to moving to Pages, Cloudflare was proxying content with TLS1.2 as the minimum. But the content from CF Pages is being served with TLS1.0 as the minimum.

Is there a setting that I’ve missed, or is this a bug in Cloudflare Pages?

Thanks,
Jon