Xenforo unfurl'd URL link name is 'Captcha'

Dear all,

we´re using latest Centmin Mod Stable on Alma Linux 9 with system up to date as of today. Server is behind Cloudflare and we are using Digital Point's App for Cloudflare as an addon.

---

Lately we are experiencing some (weird) issue(s) in our forum with unfurl.
Links to a long thread are tried to be unfurl'd - but without success because of "File is too large" (that´s what Tools > Test URL unfurling tells me).
That´s perfectly ok for me - but why is the URL name (sometimes) changed to "Captcha"?

While this link has just the URL as a link name, a link to a post in the same thread will be named "Captcha" and I can see the attached screen while the link is processed.



I´m quite sure I somehow messed up (maybe in Cloudflare) but unable to find out where. To be honest I´m hoping that George has some clue/hints about where to look since he´s extensively using Cloudflare.

Cheers,
Chris

 

rollerplausch.com is my site, yes. And I have only observed the issue on the one (!) rollerplausch.com link so far - not on github, not on $random_site. But reproducible with that 2 links.
Link direct to the thread - OK
Link to a post in the same thread - Captcha
And it´s only (!) happening on the one link mentioned in my initial post.
For instance if I try with RP ✔️ - E-Scooter, Ersatzteile & Zubehör, Zusatzakku Die "All-in-One" RollerPlausch Einkaufsliste which is a different post in the same thread - it´s ok

I´ll try if I see anything strange in WAF, thanks.