As to what happened here. Today I was scrolling the screen and I found the ball again, not anywhere I ever expected it to be. I tried a few tests and discoved there's some kind of wormhole or something. If I bounce it in the hallway where it disappeared there's 2 spots where if it touches there it disappears. One is the spot where it disappeared on me, the other is around the spot it bounced off of before it disappeared. The spot where it reappears is almost the same for both of them and it's hard to spot it there(unless someone has a mod that turns the inventory bar invisible.) Here is a screenshot to explain: