Game states that "The block couldn't be placed" when using /setblock to place air in a space occupied by a tile entity, despite working

Still happens in 14w11b.

still in 27b.

Note that it also doesn't do a block update when this happens.

Confirmed for minecraft 1.8.1

Confirmed for 1.8.2-pre4.

It also put a wrong stat value

Confirmed for

• 15w34d

Confirmed for 15w38a

The reason for that seems to be that the setBlockState(BlockPos pos, IBlockState newState, int flags) method of the /Client/src/net/minecraft/world/World.java class (MCP 1.8 names) is called twice from the processCommand(ICommandSender sender, String[] args) method in the /Client/src/net/minecraft/command/server/CommandSetBlock.java class:

public void processCommand(ICommandSender sender, String[] args) throws CommandException
{
    if (args.length < 4)
    {
        throw new WrongUsageException("commands.setblock.usage", new Object[0]);
    }
    else
    {
        //...
        
         if (!var6.isBlockLoaded(var3))
        {
            throw new CommandException("commands.setblock.outOfWorld", new Object[0]);
        }
        else
        {
            //...
            
            TileEntity var13 = var6.getTileEntity(var3);

            if (var13 != null)
            {
                if (var13 instanceof IInventory)
                {
                    ((IInventory)var13).clearInventory();
                }

                // This can be removed
                //var6.setBlockState(var3, Blocks.air.getDefaultState(), var4 == Blocks.air ? 2 : 4);
            }

            IBlockState var10 = var4.getStateFromMeta(var5);

            if (!var6.setBlockState(var3, var10, 2))
            {
                throw new CommandException("commands.setblock.noChange", new Object[0]);
            }
            else
            {
                //...
            }
        }
    }
}

This causes the block the be set to air first and as it is already air the second call will return false.

Note: The same happens for the /fill command except with barrier blocks

Could you please include that?

Confirmed for 15w51b

Confirmed for 16w06a.

Confirmed for

• 1.9.1-pre3

Also affects the /fill command with barrier blocks

Confirm for 1.9.3-pre2.

This bug also causes conditional command blocks to fail when they should succeed, and seems to affect all tileentities (not just chests).

Confirmed for 1.9.4.

I also found out about it because of conditional command blocks, in my case it was signs I was trying to replace. /fill works as a placeholder.

Can confirm for 1.11.

I think that is because minecraft destory that block and then setted air but there was already air. ( air is placed if block is destroyed )

if so maybe this can be fixed by testing if block is "air" and mode is "destroy" then only calculate size and no setblocking / filling. 😃

sorry for my bad English I am Czech.