Release 1.8.137 added Cybernetics Grade FF to bot drops. According to the news release, these are dropped by "mostly Guardians, Leviathan".

From chat on 100, it appears no one has gotten a drop from a Guardian, although they have gotten drops from Queens and Leviathans.

Either there's a bug in the drops, the drop rate is really low, or the news release should have said Queens and Levis.

The drop rate is low, and no, I didn't reveal everything that drops it. But it is mostly guardians, albeit hive guardians only.

I've never seen a Cybernetics FF drop from hive guardians, including extended leviathan sector battles.