C1 does/has done the same thing to my P45 and P45+ files in v5 and in v4. Selecting "P45+ Outdoor Daylight" from the "Base Characteristics" drop down dialog box to change from "Flash" seems to make no difference. The histogram, color temp and the tint remain the same. Perhaps, then, it is a non-issue.
One thing that does become a nuisance is that "Daylight" settings report in C1 as 4284 K. rather than ~5550 and the images are not at daylight color temperature. So, the image WB values have to be changed for all daylight images.