Corret and working URL is redirected to not valid URL displaying 404 not from my website

on my website, on some URLs, it randomly appears to redirect to 404 that is not on my server.

URL is One moment, please... you will see that it’s redirected to

Another website has the same issue on this URL: One moment, please...

When I manually purge the cache, the redirect disappears and it all works fine.

I have set the page to cache everything and I’m using firewall too, but not fight bot mode.

I’ve found this answer Cloudflare caching issue? - #6 by cbrandt but it doesn’t make any sense to me and I think it’s a different case.

So why does it occur and how to prevent it?

Thank you!

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