When teleporting through a portal, the player is "placed" 1 block forward and 3.5 blocks to the side of the portal. Attached image shows where player was "placed" after passing through portal. Glitch occurs through both directions: overworld to nether, and netther to overworld.
Environment
Windows 8.1 Pro, 64-bit; Intel Core2 Quad Core 2.66GHz, 8GB RAM, Java 1.7.0-67 64-bit
Dupe of MC-73504