Lemmy CA rich link previews for some posts show the captcha challenge, not actual content

Link posts from thetyee.ca appear to be previewing the Cloudflare captcha challenge "Attention Required! | Cloudflare" prompt instead of actual content.

What it looks like (two examples - this seems to be a consistent problem for thetyee):

(from https://lemmy.ca/post/39053782)

(from https://lemmy.ca/post/39058782)

What it should look like (a different post):

My guess is that the rich link preview is generated in Lemmy's backend, and Cloudflare thinks that the IP address of lemmy.ca's host is full of bots.

No educated guess on the solution, though, but I'd guess that other Lemmy admins have seen sort of thing too.