The color element of the CMYK color swatch changes after restarting the app

Issue summary: 
After creating a CMYK color swatch, restarting Photoshop will change the color elements.

Product and version: 
Photoshop 27.9.1  It does not occur before 27.8.

Operating system: 
I checked it on macOS 15.7.8.

Steps to reproduce: 
Create a CMYK color swatch. Example: C0 M0 Y0 K100
Restart the app

Expected result: 
The color swatch as created is retained.

Actual result: 
It has changed to a color value that has been converted from CMYK to RGB to CMYK.