Nope, it is definitely still there, I just checked in response to your question. I did check on MacOS if that makes a difference. If you built KStars from source, one issue that can prevent the 3D star profile tool from working is if you don't have the QT 3D Data Visualization module installed when you build it. I would expect it to be installed, but if it isn't then it won't build with kstars just like Ekos not being included if INDI was not found.