[Demonstration 1]

[Buggy Method]
public void setMultiplier(int multiplier) {
    if (this.value == Tile.BLOCKED_TILE || this.value == Tile.BUCKET_TILE) {
        this.multiplier = multiplier;
    }
}

[Buggy Hunk]
if(this.value == Tile.BLOCKED_TILE || this.value == Tile.BUCKET_TILE){

[Patch]
if( !(this.value == Tile.BLOCKED_TILE || this.value == Tile.BUCKET_TILE) ){

[Demonstration 2]

[Buggy Method]
@Override
public void toBytes(ByteBuf buf) {
    NetworkTools.writeString(buf, text);
}

[Buggy Hunk]
NetworkTools.writeString(buf, text);

[Patch]
NetworkTools.writeStringUTF8(buf, text);

[Demonstration 3]

[Buggy Method]
@Override
public void fromBytes(ByteBuf buf) {
    pos = NetworkTools.readPos(buf);
    viewMode = NetworkTools.readString(buf);
    sortMode = NetworkTools.readString(buf);
    groupMode = buf.readBoolean();
    filter = NetworkTools.readString(buf);
    maxSize = buf.readInt();
    numStacks = buf.readInt();
    int s = buf.readInt();
    items = new ArrayList<>(s);
    for (int i = 0; i < s; i++) {
        int slotIdx = buf.readInt();
        if (slotIdx < 0) {
            items.add(Pair.of(-slotIdx - 1, null));
        } else {
            ItemStack stack = NetworkTools.readItemStack(buf);
            items.add(Pair.of(slotIdx, stack));
        }
    }
}

[Buggy Hunk]
items.add(Pair.of(-slotIdx-1, null));

[Patch]
items.add(Pair.of(-slotIdx-1, ItemStackTools.getEmptyStack()));