Affects Version/s: Minecraft 1.5.1
Fix Version/s: None
Build something like in the attached screenshots. When sending a minecart from the Nether, it moves along the U-turn but refuses to travel back a second time, i.e. it simply gets stuck inside the portal block.
You could also build a railway track to a completely different portal. The behavior is the same there. (I tested that as well.)
- 2013-03-21_23.51.34.png: The basic setup. Send a minecart from the nether to this portal.
- 2013-03-21_23.52.13.png: A minecart that got stuck in a portal block after moving along the U-turn.