Affects Version/s: Minecraft 1.8.1, Minecraft 1.8.2-pre1
Fix Version/s: None
After patch 1.8.1 certain nether portals will become desynched when multiple entities or players pass through them. If two players pass through a portal in rapid succession they will enter into the nether at an unrelated, unlinked portal, however if they pause for a few seconds between entering the portal they will arrive in the nether at the correct portal. Occasionally full client-desynch on multiplayer will occur, causing chunks around the client entering the overworld from the nether, not to load requiring client reconnect.
These portals have been in place for a long time and no additional portals have been built nearby to interfere, and are not within range to create a dual-destination portal. This behavior was not observable in 1.8, but can be observed in 1.8.1.
After patch 1.8.1 a specific nether portal stopped working in my world which kicks everyone off the server when 2 or more mobs enter the portal. In addition to that, if you throw any item through the portal and then go through said portal, the portal takes you to a completely unconnected nether portal far away. Also, if you throw two items into the nether portal, one at a time, it kicks everyone off the server and gives the "server closed" error. However, if you do not throw anything through this specific nether portal, it takes you to the correct place. I haven't touched these portals in over a month and it all started on Nov. 24th. after the 1.8.1 patch. I cannot give you a crash report, only logs because I and everyone else keep getting kicked off the server when 2 or more mobs go through it, the game doesn't crash but there is definitely a bug. The portal is used for a mob farm. I cannot recreate any of these results with any other portals in my world. It is only this specific portal. The portal is connected correctly, I know how all of the nether portal linking mechanics work and they all worked perfectly until 1.8.1 and I have no clue as to why this is happening nor how to fix it.
Here is a crash report of this world copied into a single player world from my minecraft realm server. The problems still occur in my single player as they do in multiplayer server.