Wasn't this eliminated for the raketen in one of the previous patches?
No it wasn't, like every single time balance team announced that they have fixed collision for one or the other projectile. Raketen still beating to that that piece of dirt like there's no tomorrow.
Put in that raketen has way lower accuracy at its max range than any at gun at the same range, that its firing from a much lower barrel, closer to the ground...and you get the results the raketen is famous for.
At this point i don't believe that patches will be able to fix any projectile collision.