If the blown highlights (particularly gray/white areas, like clouds) appear magenta, that is because the raw converter does not know, that those pixels are saturated. This can happen if the raw converter sets the saturation level too high.
All the P30 files I have saturate at 65535 and Adobe DNG converter does assume this saturation level (higher is not possible anyway).
If your camera copy deviates from this "standard", that can cause errors. If you upload such a raw file (native please), I can take a look at it.
You too can analyze the situation if you have a Windows, or use Parallels or Crossover on Mac:
http://www.cryptobola.com/PhotoBola/Rawnalyze.htm (it can cause you some surprises re the ISO capability of your camera).