Hi,
Sure!
The block is reported by Cloudflare firewall – it is a false positive match. Unfortuantely there are no other details available. It happens because cloudflare heuristics picks up a “suspicious” payload when submitting the form. Cloudflare firewall is very complex and has hundreds of thousands of active rules, I have had similar issue with other plugins too, so it’s not uncommon. Most of the time a word or a string triggers it within the settings.
Can you please add temporary FTP access so I can make changes to the search plugin files? I will try to debug ste-by-step the submitted payload to see which value cloudflare doesn’t like. It’s a painful process, but at least I will know what to look for if this issue may repeat for someone else.