Infinite inertia with two connected minecarts with one inbetween

[Jummit]

If you place three minecarts and chain the first and third one together, they will move in one direction indefinitely.
This is a problem in vanilla too, but I think the cause is different here.

[CammiePone]

Oh that's actually really funny. Unfortunately, there isnt really much of a fix that wont break other things (I know why it's happening, trust me) sooooo...