Tried a couple of approaches, but the check always shows up.
Even though I still doubt that, there is the chance that I redirected to example.com. I do doubt, that I set it up like that, because I do know better and because I think I remember it was the right URL, but I can’t rule it out any more. If I did, I’d slap myself.
Anyhow, even if I managed to play the system somehow, it’s obviously not straightforward to do so and in general I’d say Cloudflare does not support that yet - at least until someone checked out Page rule validation should check other page rules.
If you say you definitely want it to show up in the browser you can only implement it on the server or via a Worker. Preferably the former, though.