P: Color Settings / Custom RGB tool is now bugged

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:

https://community.adobe.com/t5/photoshop/color-settings-custom-rgb-choosing-exact-custom-primaries-no-longer-works/m-p/11621651?page=1 

I used/use this simple tool to derive custom linear scanner profiles based on the exact scanner color space/spectral sensitivity.