QUIC not always working over IPv6 (single site)

I’m seeing this issue on a Cloudflare (orange cloud) domain: QUIC not always working over IPv6
It only happens on ipv6. Other sites work fine (on Cloudflare - I’ve tested many of my other sites).

I’ve also checked sites hosted on exactly the same setup as the site I have issue with, and it’s working just fine. Anyone have any ideas? We’re on the free plan (though we do pay for APO) so can’t contact CF directly about this I don’t think.

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