Minecarts stop moving before entering the last loaded chunk(read: "end of the world").

To reproduce, create a long ((render distance + 1) * 16) minecart track, when riding the track from either end, the minecart will freeze up a little bit before the end of the track. The track I happened to be using traveled north/south.

The screenshot was taken while the minecart was frozen right before entering the last chunk before the end of the world

Related to MC-90163