Haven't done any tests as I don't stay up at night wondering about such esoterica. However, it appears to me that the aircraft do exhibit Mach tuck behavior approaching the Mach.
HT will undoubtedly chime in here with a one word answer for you though.
Tell me, did your Mom model polite behavior? It appears not (to me) because the only time I see you post in here is when you think you've found a new ruler for your AH/IL2 whang measuring contest. Do everyone a favor please: zip up, youngster and be on your way.