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There was a time when they were dumping encryption keys into search engine caches for weeks, and had the audacity to claim here, the issue was "mostly" solved. Until they were called out on it by Google Project Zero team...

"Cloudflare Reverse Proxies Are Dumping Uninitialized Memory" - https://news.ycombinator.com/item?id=13718752

There still exist many bypasses that work in a lot of cases. There's even services for it now. Wouldn't be surprised if that or similar was a technique employed.

Saw.t