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Photoshop 22.0.1. Tested on three machines, one is a Mac.
How to replicate: enter/change white point or any RGB xy values, close the window. Reenter to check. Slightly different xy numbers and the white point resets to D50. It's not just a refresh bug, saved profiles reflect the displayed numbers.
Confirmed by other users too:
I used/use this simple tool to derive custom linear scanner profiles based on the exact scanner color space/spectral sensitivity.