splined runways

[xpupx]

Is it only me or does anyone else have splined runways not show up when playing multiplayer games? An example of this would be putting a splined concrete runway over a an existing grass one in order to keep the frame-rate up on takeoff and landings! The runway is there an usable in game when you test the map but as soon as it is hosted by someone else its gone?
Any ideas?

[Ataros]

Yes, it is bugged.

I've read also that splineroads increase mission loading times significantly.