Hello, please make sure the most recent versions of Photoshop have been installed for version 23.x and version 22.5.x.
When opening a document with a Gradient Map created in most recent version of 23.x in version 22.5.4 or newer, the interpolation method of the gradient map defaults to Classic.
If this is not what is happening, please provide steps on the workflow you are doing and we'll investigate. Thank you