P: Grayscale ramp sampling incorrect when in web safe mode (Color panel)

Reproduce: Open the color panel window, choose Grayscale ramp and set it to Web safe (6 value split), the areas don't match their fields of sampling / are offset.

It's most offset to the left, getting increasingly correct going right.

Got gateway error when trying to upload gif, but here is a demonstration:
https://i.postimg.cc/qv725nC8/PS-bars.gif

It gets most obvious sliding across them all, not knowing about it and just clicking to sample like most common use case will have the user run a ~50% risk of getting the wrong value.

(This is in the latest PS CC Windows release, but it was the same in prior releases afaik)