Faction Cores - to destroy, Enemy required for different civ, but not same civ

To destroy a faction core, if the faction you are raiding is in a different civ, if you attack the core you get a "You can only damage cores of enemy factions." message, and have to use /f enemy before you can damage the core, however, if the faction belongs to the same civ (in my case, Planes Walker raiding another Planes faction), you do NOT have to enemy to damage the core. This doesn't make any sense, Enemying a faction is an extra step, and also potentially lets the faction you raided know who destroyed their core. I assume it's most likely meant to be the opposite - different civs, no enemy required, same civ, /f enemy required. Last season, to raid a faction in the same civ, you had to use the "/f betray" command, so requiring you to enemy for destroying same civ cores only would be more in line with last season too