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It does not "err" in reading the white balance, it deliberately ignores it.
This has been discussed to death here. Do a forum search; even some of the thread titles will give you an idea that they discuss this question.
I remember to have read, that Nikon's color temperature specifications are far off the true (measured) values.
I guess ACR corrects these values. It is logical, as ACR and the DNG convereter act the same way, and the DNG converter has to convert the white balance in Planckian values.
I suggest you to shoot a white card or alike in different light with different settings and try if ACR shows the white as white.
I have another suggestion:
1. Shoot a white sheet in any light, large enough for using the shot as WB preset,
2. use this shot as WB preset,
3. shoot it again in the same light, with the preset WB,
4. compare the temperature in Nikon NX and ACR,
5. verify if the white sheet is white in ACR,
6. pick WB on it and compare the resulting temperature/tint with what ACR calculated from the metadata.
Thanks for your replies. It may well be that Nikon's color temperature values are off. However 5400K is a reasonable value for a flash exposure, and for ACR to "correct" this to 6150K does not seem reasonable.
If I set the camera WB to flash (5400K) and take an exposure of a white wall, when the raw image is opened in ACR the "as shot" temp shows 6150K and the image is obviously way too warm. Changing the WB in ACR to 5400K produces a neutral image. Using the WB eyedropper in ACR also shifts the temp to approx. 5400K.
I don't have access to Nikon NX. What would be the point of using the camera's WB preset capability if ACR is incapable of reading the metadata correctly.
I don't know if ACR is reading the Nikon WB setting incorrectly, or it converts that incorrectly. ACR processes the WB setting generally, however it may be different with some Nikons. It had been for three years ago, IIRC, that Nikon started "cryptographically" encoding the white balance; this had unleashed a huge outcry (I changed to Canon because of this attitude of Nikon). Although David Coffin has broken the encoding in no time, Adobe had reservations for a while.
It is possible, that this is the cause for the discrepance.
Anyway, it's bad, no question about that. Not all images contain a suitable spot for picking WB.
[EDITED never mind]