I noticed that last Friday. I was on a roadtrip, and none of the superchargers on my path would show me how many people were charging.
I also noticed the nav would not route me through one particular supercharger on my trip, but it did show on the nav when clicking on the map to display superchargers. I called Tesla, and they said the supercharger was available but charging at a reduced capacity and being worked on. When I got there several hours later, all was good and the supercharger was available for routing again.