It's not a bug, I made the same post thinking that the problem was because of my display that runs in 144hz and accidentally discovered the way to slow it down after mess with it a bit. When you are in "Free Play" mode, down to the bottom left you will see a number with - and + sings alongside them, you simply choose the minus button until it slows down to your liking. I'm not sure before, but I think that thing is a new feature to moderate the speed of the gameplay. I hope it helps!