I’ve found that I was missing the Layer State Icons in the Layer Properties.
Now I rarely use the buttons now that I work on mainly small projects. But sometimes I do find it comes in handy to save layer states, especially when working with older drawings. So to get the missing layer state icons back I had to collapse the filters panel and then the icons show up.
Once collapsed and re-expanded the layer state icons stay visible.
Unfortunately, the change doesn’t stick, and the next time you restart AutoCAD you have to do the steps again.