[Demonstration 1]

[Buggy Method]
@Override
public IBlockState getExtendedState(IBlockState state, IBlockAccess world, BlockPos pos) {
    TileEntity te = world.getTileEntity(pos);
    if (te instanceof TileEntityEnergyChannel) {
        TileEntityEnergyChannel cte = (TileEntityEnergyChannel) te;
        return cte.getState();
    }
    return state;
}

[Buggy Hunk]
return cte.getState();

[Patch]
return cte.getState(state);

[Demonstration 2]

[Buggy Method]
public BlockPos getTrueMiddle(World world, BlockPos pos, IBlockState state) {
    if (isCorner(world, pos, state)) {
        BlockPos opposite = getOppositeCorner(world, pos, state);
        if (opposite != null) {
            int dx = (opposite.getX() - pos.getX()) / 2;
            int dy = (opposite.getY() - pos.getY()) / 2;
            int dz = (opposite.getZ() - pos.getZ()) / 2;
            if (world.isAirBlock(new BlockPos(pos.getX() + dx, pos.getY() + dy, pos.getZ() + dz))) {
                return new BlockPos(pos.getX() + dx, pos.getY() + dy, pos.getZ() + dz);
            }
        }
    } else if (isMiddle(world, pos, state)) {
        for (EnumFacing facing : EnumFacing.values()) {
            if (isCorner(world, pos.offset(facing), state)) {
                BlockPos opposite = getOppositeCorner(world, pos, state);
                if (opposite != null) {
                    int dx = (opposite.getX() - pos.getX()) / 2;
                    int dy = (opposite.getY() - pos.getY()) / 2;
                    int dz = (opposite.getZ() - pos.getZ()) / 2;
                    if (world.isAirBlock(new BlockPos(pos.getX() + dx, pos.getY() + dy, pos.getZ() + dz))) {
                        return new BlockPos(pos.getX() + dx, pos.getY() + dy, pos.getZ() + dz);
                    }
                }
            }
        }
    }
    return null;
}

[Buggy Hunk]
BlockPos opposite = getOppositeCorner(world, pos, state);

[Patch]
BlockPos opposite = getOppositeCorner(world, pos.offset(facing), state);

[Demonstration 3]

[Buggy Method]
@Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Rectangle bounds = g.getClipBounds();
    if (cell.isLocked()) {
        g.setColor(Color.RED);
    } else {
        if (isFocusOwner()) {
            g.setColor(Color.BLUE);
        } else {
            g.setColor(Color.BLACK);
        }
    }
    g.drawOval(0, 0, bounds.width, bounds.height);
    g.setColor(getForeground());
    if (cell.isAlphabetical()) {
        String value = cell.value();
        centerText(g, value);
    } else if (cell.isPeg()) {
        g.fillOval(10, 10, bounds.width - 20, bounds.height - 20);
    } else if (cell.isBlank()) {
        g.setColor(getBackground());
        g.fillOval(2, 2, bounds.width - 4, bounds.height - 4);
    }
}

[Buggy Hunk]
Rectangle bounds = g.getClipBounds();

[Patch]
Rectangle bounds = getBounds();