As I said all along! Everything will work out as predicted. Proof right here. Mandalore has become a war zone, the Duchess is dead and this episode turned out to be one of the best of the whole show. Even getting to see Darth Sidious absolutely own both Savage and Maul.
Back when the show barely started it was already said that Mandalore is ruled by a pacifist government, a product of massive blood shed, a pacifist movement among the New Mandalorians, a Republic bombardment that turned parts of the planet from jungle to Desert and completed by a civil war in which Jango Fett is the only survivor of the warrior new mandalorian faction. The pacifist have now been massacred, another bloody civil war has been started leaving Mandalore vulnerable to a new leader coming in which should be Spar once the war ends. No continuity error here