Richard James

I cannot replicate this bug in a new world in Minecraft 1.5

Portals and the Nether were intended to be a fast travel system. However when they were introduced the implementation was broken.

Notch said this on his Tumblr shortly after on the 5th Nov 2010

• Attempted to fix the portal dupe bug where you could exit through a different (new) one than the one you entered through.

About the portals, it’s possible that two portals can lead to the same portal in the Nether. This is because the space down there is compressed by a factor of 8, and I haven’t come up with a good way to fix this yet.

I might just end up doing an explicit one-to-one binding between portal pairs, but that’s nontrivial as it should survive the portal being temporarily destroyed. If you TNT a portal then rebuild it, you’d expect it to still lead to the same place, right?

From: http://notch.tumblr.com/post/1486843146/minecraft-alpha-1-2-1-minecraft-server-0-2-3

As far as I can see this bug has been placed in the too hard basket ever since. It has not been fixed and now some players assume it is standard behaviour.

I was having this problem in 1.4.6 my maps suddenly did not work from the previous version. This was due to the 'dimension' value in the map data having changed from integer to byte type. Using NBTexplorer I was able to change the type of these variables and my maps became useful again.

I'm not certain which version of Minecraft changed these values. I will note that I had map problems before but quitting the game and starting it again fixed them before but not this time.