I'm wondering if that was an early Beaufighter feature and that is why the tail on the Mark 21 is so distinctively designed. There had to be a reason for that.
Entering service in the nocturnal intercept role in September 1940 ... the Beaufighter displayed a measure of handling precocity. Extreme care had to be exercised to avoid incipient swing during takeoff; a side-to-side yawing during undercarriage retraction was not easily controllable and prior to adoption of tailplane dihedral it suffered pronounced fore-and-aft instability, particularly noticeable in the climb and landing approach.