Lodestar snappy decompression issue

The token of the negotiated protocol ID specifies the type of encoding to be used for the req/resp interaction. Only one value is possible at this time:

ssz_snappy: The contents are first SSZ-encoded and then compressed with Snappy frames compression. For objects containing a single field, only the field is SSZ-encoded not a container with a single field. For example, the BeaconBlocksByRoot request is an SSZ-encoded list of Root's. This encoding type MUST be supported by all clients.

func (r *Reader) fill() error {
	...
	if chunkType <= 0x7f {
			// Section 4.5. Reserved unskippable chunks (chunk types 0x02-0x7f).
			r.err = ErrUnsupported
			return r.err
		}
		// Section 4.4 Padding (chunk type 0xfe).
		// Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
		if !r.readFull(r.buf[:chunkLen], false) {
			return r.err
		}

uncompress(chunk: Uint8ArrayList): Uint8ArrayList | null {
    this.buffer.append(chunk);
    const result = new Uint8ArrayList();
    while (this.buffer.length > 0) {
      if (this.buffer.length < 4) break;

      const type = getChunkType(this.buffer.get(0));
      const frameSize = getFrameSize(this.buffer, 1);

      if (this.buffer.length - 4 < frameSize) {
        break;
      }

      const data = this.buffer.subarray(4, 4 + frameSize);
      this.buffer.consume(4 + frameSize);

      if (!this.state.foundIdentifier && type !== ChunkType.IDENTIFIER) {
        throw "malformed input: must begin with an identifier";
      }

      if (type === ChunkType.IDENTIFIER) {
        if (!Buffer.prototype.equals.call(data, IDENTIFIER)) {
          throw "malformed input: bad identifier";
        }
        this.state.foundIdentifier = true;
        continue;
      }

      if (type === ChunkType.COMPRESSED) {
        result.append(uncompress(data.subarray(4)));
      }
      if (type === ChunkType.UNCOMPRESSED) {
        result.append(data.subarray(4));
      }
    }
    if (result.length === 0) {
      return null;
    }
    return result;
  }

 function getChunkType(value: number): ChunkType {
  switch (value) {
    case ChunkType.IDENTIFIER:
      return ChunkType.IDENTIFIER;
    case ChunkType.COMPRESSED:
      return ChunkType.COMPRESSED;
    case ChunkType.UNCOMPRESSED:
      return ChunkType.UNCOMPRESSED;
    case ChunkType.PADDING:
      return ChunkType.PADDING;
    default:
      throw new Error("Unsupported snappy chunk type");
  }

checking chunk type=255
checking chunk type=1
got uncompressed chunk..
checking chunk type=129
file:///../poc/dec1.mjs:74
            throw new Error("Unsupported snappy chunk type");