Minecraft Wiki:Issues

This page's purpose is to list all the bugs players have come across. Most of the single-player bugs also apply to multi-player.

World Select

 * Changing resolution on the World Select screen causes all buttons to appear twice.
 * On Mac OS X Systems, the World Select screen will not appear at all, making the game unplayable on Mac systems.

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.
 * Seemingly related to the above glitch is one where a specific chunk will constantly revert. In chunks that constantly revert, water won't duplicate if it's flowing, and water tends to linger much like lava when the source is removed.
 * 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.
 * Sometimes you can see through everything and it happens on all your games. The way you can get rid of it is close Minecraft then open it then it will work fine.
 * Iron bars may not appear in the inventory when collected
 * If you wait a lot of time after map chunks are generated and then continue forward causing the game to generate new map chunks, it will cause weird structures which don't even connect properly with the map. Sometimes even causing mountains which are in a sense, cut in half. Furthermore, if one chuck ends in an ocean, and the other starts of with land with an underground cave in it, the water will not enter the cave
 * When destroying a Furnace, unlike Chests, anything inside the Furnace will be permanently destroyed.
 * When sand is generated above a cave (or any opening), it will float until a space by it is modified in any way.

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 a 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.)
 * If you go under a water stream your boat will accelerate and rise towards the sky.

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.
 * Chests sometimes revert contents to previous configuration. Opening a chest, modifying the content, exiting, then going back in displays the items the chest had when it was first accessed. This causes newly placed items to be lost and removed items to be duplicated.

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. They will become visible again if you place normal blocks near to them though.

Jukebox

 * Inserting a record and removing it before the song ends will cause the jukebox to eject a duplicate. Only one of the records will be retrievable, but 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.

Minecart

 * When spawning mine carts on a small track, they will gain momentum from colliding in to each other.
 * If there are 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 are sitting in, you will fall one block under ground.
 * Sometimes moving Minecarts disappear entirely.
 * Trying to exit in a two block high area can cause the player to suffocate within the Minecart.
 * If you open your inventory while in a Minecart, your player hand model will screw up.

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.

Signs

 * Placing a sign on a block that is placed at the highest possible location in the world will cause the client to crash.

Stairs

 * Placing steps and then destroying them doesn't give you the stairs back, only a Cobblestone or Wood block.
 * Attempting to destroy stairs will sometimes destroy the block behind them instead.
 * Placing any kind of block on top of the stairs block will convert the latter into block which stairs were made of. This can be abused to quickly destroy stairs.

Water
(To clarify this a bit, on the surface, you are blocked from placing a block on yourself, underwater, this blocking does not exist).
 * While underwater, you are able to place blocks at the location of the player.
 * It is possible for multiple water currents to crash against each other and create an inescapable rip-tide. Not only will this rip tide hold you in one place, it will also throw you from a boat if you are sailing it.

Doors

 * If doors are placed next to two stapled cactus-blocks, the door will immediately get destroyed and will drop two doors instead of one.

Snow

 * Utilizing snow, one can place saplings and cacti on any block. The sapling will grow, still, however, the cacti will break when they first grow.

General

 * Often times, blocks can not be reliably removed. Attempting  to remove them will cause them to temporarily disappear, then reappear.
 * Crouching is not visible to other players.

Health

 * Players and mobs are invincible. Enemy mobs can kill each other and also die from water, lava, TNT and Cacti.

Mob Spawners

 * Even with the monsters variable of the server.properties file set to false, Mob Spawners will spawn monsters. The variable does affect whether night-time monsters spawn.

Neutral Mobs

 * Sheep and cows are often unseen in SMP, while pigs and chickens will spawn often. Oddly enough, chickens seem to drop leather occasionally.

Water and Lava

 * You can collect source blocks, but they will reappear shortly after being collected. Dropping them will  create a source block temporarily, but it will not spread. Instead, it  will disappear after some time. Other players never see the source  blocks you place. As a workaround, a server admin can give a player (by  using the /give command) source blocks (id 8 for Water, id 10 for Lava)  to place in the same way any other block would be placed.

Furnaces and Coal

 * Coal can smelt 8 items per lump. But in some cases, smelting a multiple of 8 items will use up all the coal, but leave one item without smelting. When cooking Pork, the furnace will not take any more coal after having burnt the first lump. The player has to close the furnace window and reopen it to continue cooking. The furnace will continue to show the fire animation after this, even when empty. Also, the animations in the furnace window (arrow showing progress, fire icon when consuming the fuel) seem to be broken as well.

Trees

 * Planting a sapling and waiting a bit will yield tree trunks with a weird  distribution of leaves, and in some cases, no leaves at all. Trees can  also grow but be invisible, making it impossible to traverse a tree farm  after a while. Rejoining the server appears to make invisible trees  visible again and fire will swiftly cause phantom foliage to be made  manifest. Trees with "weird leaves" cannot be cut down, as they  regenerate instead of yielding wood blocks.
 * Placing a torch on a leaf block will not decrease the inventory torch count for the player, making it possible to place them on leaf blocks without ever running out of torches.

Doors

 * A door may seem to be open, yet not allow the player to walk through it. Other players might see the same door to be closed and  vice-versa. The door needs to be closed, then opened again before the  player is able to walk through it, yet waiting too long may lead to the  door closing on its own even when there are no pressure plates involved.  When trying to destroy a door, it will likely split in half, with  the top half open and the bottom half closed, or vice-versa.

Pressure Plates

 * Don't trigger doors when set right next to them.

Stone Buttons

 * In addition to not triggering doors, stone buttons may jump from the wall they are actually placed on to the one opposite upon being pressed the first time if there is just one block of air in between. They can then not be removed reliably without also removing the block to which they are attached.

Tools

 * Dropping them (e.g. by pressing Q while holding them) and picking them back up will revert their damage to zero. Probably related to the player and mob server-side health issue. Applies to all items that take damage (e.g.: Armor).

Paintings

 * When copying an SSP world onto an SMP server, paintings are removed in the transition. Paintings might disappear some  time after being placed in a few cases. If they are destroyed after  being placed, they cannot be picked back up.

Boats

 * When they break, their materials (planks and sticks) cannot be picked up. Boats are invisible to other players.

Wheat Seeds

 * To a player, it will appear that some seeds cannot be picked up. But to the other players, these seeds will be invisible. Hoeing the ground directly beneath you improves the chances of harvesting the seeds.

Crops

 * The current growth of a crop will not update unless it is right-clicked by an item.

Chests

 * Destroying a chest will spill its contents, and every item in the chest will be duplicated. Only half of the items visible to the player can be picked up, so no items are gained nor lost in the process.
 * Also, quickly clicking on items and moving them around can cause them to disappear from your inventory, and in some cases to be  duplicated.
 * The duplication seems to be cause by a server/client sync error.   When holding the item place it and then  quickly pick it up.  Notice that  the item with flash again in the bin  location where you just put it.   It seems the server is sending back  that the item is still there after you have picked it up.  While the  'ghost' item is shown in the bin  placing the item in your hand will  cause the item to be duplicated.  In the case of stacks it will double the stack and in the case of  un-stackable items it will remain in your  hand (mouse) and also in the bin.
 * The disappearing seems to be caused by the same bug just in the opposite way.  Instead of the server lagging behind the client and telling it that the item is still there the server will erroneously delete

Redstone

 * Usually does not function, sometimes with slow and unexpected results.

Minecarts

 * Minecarts do not function as expected. Minecarts can end up duplicated when used, wobble randomly, have their resource be unable to be retrieved, and cause severe client lag.

Minecart tracks

 * Placing or destroying track will cause client-side performance issues, requiring the client to reconnect to the server. Failure to disconnect will result in the client becoming unresponsive.

Reeds

 * Reeds can only be placed in water, will not grow and eventually be destroyed leaving a  reed bushel behind. If one repeatedly places reeds in the same square  they will occasionally duplicate.

Arrows

 * Arrows can only be seen by the player that shoots them, you also can not see any arrows that a skeleton shoots.

Blocks

 * Blocks in areas of approx. 5x5x5 around the player will randomly disappear / break and you can pick them up again.

Snowballs

 * Shovelling Snow does not create a Snowball.

Sand and Snow

 * Sand will not fall down if Snow is underneath it.