The DH Vampire was of interesting in terms of pitch characteristics at high mach numbers, not really mach tuck as understood today. The RAAF early single seat aircraft had auxiliary engine air intakes (elephant ears) mounted on the top of the fuselage. A number of these aircraft crashed from high speed dives after pitching down at high mach. The fix was to change the position of the auxiliary intakes to the lower fuselage. While I don't know the aerodynamics involved, it would appear that the wake of the upper aux intakes would impinge on the tailplane at high mach.
The two seat Vampire Mk35 had a marked pitch up at compressibility buffet onset. The onset of compressibility was quite sudden, the pitch up was attributed to sudden shock stall of the wing markedly reducing the nose down lift/weight couple, with no change in the tailplane down load.
I acknowledge that the stability and control characteristics of these ancient aircraft should not be compared with even the first generation of swept wing aircraft, although these aircraft had their own handling problems.