Protocol oddity

[Bill]

I've no idea if this is new or has always been this way, but if I do a basic (IPv4) ping to idnet.com it works perfectly, but with an IPv6 one (ping6) I get "nodename nor servname provided, or not known", suggesting no IPv6 record on the DNS server?

But browsing to idnet.com shows the connection as being being over IPv6...

Main DNS is Cloudflare (1.1.1.1) with Google (8.8.8.8) as backup.

Doesn't happen on other sites I've tried and it's not causing any issue that I can see, it just seems odd.