This happened to me as well. A recruiter told me that I had done very well in the PS, and would move me forward to the virtual onsite. I prepared for a week, including a whole weekend. Then I received a call from the recruiter telling me that the team that wanted me to interview changed their product direction, and would not move forward with me anymore. I was pretty upset, I just said thank you for letting me know since I did not know and do not know what else I could say. It was a totally waste of my time. I was actually pretty busy in that week, I could have done something else over that weekend. I guess this is how life goes.