Minecarts are not working on cornered rails.

Minecarts are not working on cornered rails.

What I expected to happen was...:
for the minecart to turn on the corner.

What actually happened was...:
It either gets stuck, comes back, or detaches from the track.

Steps to Reproduce:
1. Make a minecart track.
2. put a cornered rail down.
3. activate or move the minecart to the corner.