28        private array $legacyPreHills,
 
 
   36    public static function read(ByteBufferReader $in) : self{
 
   38        for($i = 0, $count = VarInt::readUnsignedInt($in); $i < $count; ++$i){
 
   39            $legacyPreHills[] = BiomeConditionalTransformationData::read($in);
 
   47    public function write(ByteBufferWriter $out) : void{
 
   48        VarInt::writeUnsignedInt($out, count($this->legacyPreHills));
 
   49        foreach($this->legacyPreHills as $biome){