Program: 58072
Project: 58072
Buggy source:
/** 
 * Set the block at the location
 * @param world   World in which the block should be set
 * @param x       X Coordinate
 * @param y       Y Coordinate
 * @param z       Z Coordinate
 * @param blockId Block ID
 * @param data    Block Data Value
 * @return true
 */
@Override public void set(final World world,final int x,final int y,final int z,final int id,final byte data){
switch (id) {
case 54:
case 130:
case 146:
case 27:
case 63:
case 68:
case 313:
case 28:
case 66:
case 157:
case 61:
case 62:
case 158:
case 23:
case 123:
case 124:
case 29:
case 33:
case 151:
case 178:
{
      final Block block=world.getBlockAt(x,y,z);
      if (block.getData() == data) {
        if (block.getTypeId() != id) {
          block.setTypeId(id,false);
        }
      }
 else {
        if (block.getTypeId() == id) {
          block.setData(data,false);
        }
 else {
          block.setTypeIdAndData(id,data,false);
        }
      }
      return;
    }
}
final Object w=methodGetHandle.of(world).call();
final Object chunk=methodGetChunkAt.of(w).call(x >> 4,z >> 4);
final Object pos=constructorBlockPosition.create(x & 0x0f,y,z & 0x0f);
final Object combined=methodGetByCombinedId.of(null).call(id + (data << 12));
methodA.of(chunk).call(pos,combined);
}

Fixed version (ground truth):
/** 
 * Set the block at the location
 * @param world   World in which the block should be set
 * @param x       X Coordinate
 * @param y       Y Coordinate
 * @param z       Z Coordinate
 * @param blockId Block ID
 * @param data    Block Data Value
 * @return true
 */
@SuppressWarnings("String_Node_Str") @Override public void set(final World world,final int x,final int y,final int z,final int id,final byte data){
switch (id) {
case 54:
case 130:
case 142:
case 27:
case 137:
case 52:
case 154:
case 84:
case 25:
case 144:
case 138:
case 176:
case 177:
case 63:
case 68:
case 323:
case 117:
case 28:
case 66:
case 157:
case 61:
case 62:
case 158:
case 23:
case 123:
case 124:
case 29:
case 33:
case 151:
case 178:
{
      final Block block=world.getBlockAt(x,y,z);
      if (block.getData() == data) {
        if (block.getTypeId() != id) {
          block.setTypeId(id,false);
        }
      }
 else {
        if (block.getTypeId() == id) {
          block.setData(data,false);
        }
 else {
          block.setTypeIdAndData(id,data,false);
        }
      }
      return;
    }
}
int currentId=world.getBlockAt(x,y,z).getTypeId();
if (currentId == id) {
  return;
}
switch (currentId) {
case 54:
case 130:
case 142:
case 27:
case 137:
case 52:
case 154:
case 84:
case 25:
case 144:
case 138:
case 176:
case 177:
case 63:
case 68:
case 323:
case 117:
case 28:
case 66:
case 157:
case 61:
case 62:
case 158:
case 23:
case 123:
case 124:
case 29:
case 33:
case 151:
case 178:
{
    final Block block=world.getBlockAt(x,y,z);
    if (block.getData() == data) {
      if (block.getTypeId() != id) {
        block.setTypeId(id,false);
      }
    }
 else {
      if (block.getTypeId() == id) {
        block.setData(data,false);
      }
 else {
        block.setTypeIdAndData(id,data,false);
      }
    }
    return;
  }
}
int X=x >> 4;
int Z=z >> 4;
ChunkLoc loc=new ChunkLoc(X,Z);
if (!loc.equals(lastLoc)) {
world.loadChunk(X,Z,false);
lastLoc=loc;
}
final Object w=methodGetHandle.of(world).call();
final Object chunk=methodGetChunkAt.of(w).call(x >> 4,z >> 4);
final Object pos=constructorBlockPosition.create(x & 0x0f,y,z & 0x0f);
final Object combined=methodGetByCombinedId.of(null).call(id + (data << 12));
methodA.of(chunk).call(pos,combined);
}