I tested again in MBT ( because despite their common ancestry they are more like brothers than twins and there are differences )
I restricted the test to deploy and I used tanks, APC. utility vehicles and medium trucks as the transport and then I "dropped a AO unit onto a hex containing the vehicle" as described and in every case the A0 was shown to be like this
Not........." placed at the lower part of the hex rather than the upper part "
I have not seen it reversed. What nation are you using?