This has nothing to do with consensus.

Nothing on the Feathercoin network or code is broken.  


I am working under the assumption this is a private miner who probably has access to a custom coded miner software or has asics/fpgas.  

There is no known ASIC or FPGA for neoscrypt that I know of...a lot of scams and fakes..nothing real.   However behind closed doors, anything is possible.