Minecraft Wiki:Issues

This page's purpose is to list all the bugs we know.

World Select

 * Changing resolution on the World Select screen causes all buttons to appear twice.

General

 * A glitch has been observed where, occasionally, a given area of blocks can revert to their original state, partially or completely undoing any construction or mining that had been done in that area. Usually this happens after a long excursion into one of the natural cave systems.
 * You are unable to directly swap items in your inventory when the two items are same. This is important if you would like to swap similar items with different durabilities.

Arrows

 * Arrows hitting doors can float if the door changes it's open/closed state.
 * Arrows can seem to be floating when hitting fences.

Boats

 * When entering a boat on ground it will show a splash effect similar than on water.
 * When falling on a boat there is no fall damage.
 * If you manage to stand on your boat while it is under water the boat won't move to any direction.
 * When entering a boat and holding an usable item the item will be used/spawned. (Food will be eaten, another boat will be spawned, etc...)(this happens with ANY item. not only boats. EG, furnace, workbench, chest etc. etc.)
 * If you go under a water stream your boat will accelerate and rise towards the sky.

Fences

 * Fences on top of blocks will have all faces on its underside's black.
 * Stepping on a fence is counted as an illegal operation.
 * Occasionally placed fences will become invisible.

Minecart

 * If spawning many mine carts on a small track, they will gain momentum from colliding in to each other.
 * If there is too many mine carts in a world, the game will crash.
 * It is possible to gain unending speed for a mine cart by abusing the bug by spawning many carts on a small track.
 * When destroying a mine cart, you will fall one block under the ground.
 * Sometimes moving Minecarts disappear entirely.

Chests

 * If you open a chest at the same time as pressing a movement key, your character will continuously move in that direction until you click on the chest again. This is also fixed by pushing the same movement key after leaving the chest menu.

Water
(To clarify this a bit, on the surface, you are blocked from placing a block on yourself, underwater, this blocking does not exist).
 * If underwater you build a block at the same place where you are and you will suffocate until you move

Mobs

 * If a mob is riding a mine cart and 2 (or more) mine carts get stuck in each other, after destroying or moving the carts away from the other carts the mobs will be invisible.

Paintings

 * If a painting is placed and immediately removed, there is a chance that the picture frame will get duplicated.
 * In SMP, a painting cannot be picked up once removed. Also, you cannot see other people's paintings.

Jukebox

 * When inserting a record and removing it before the song stop, the Jukebox will duplicate it, Although, only one of the record will be pick-able, the second will remain stuck in world and eventually disappear after a certain amount of time. It is possible to abuse this bug to spawn hundreds of records.