The odd thing is there is a German guy on youtube that got the new A90 Supra already and tried to dyno it and was having the same issue, it wouldn't rev to redline and it would auto shift for him even in manual mode and dyno mode. Doesn't make since for the Supra since it is only 2wd, whereas I can see why your AWD is having issues on rwd only Dyno. Seems like there is a bug or something in the software.
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