Jsch stuck on cd throwing error code 4 without any message in integration test with testcontainer

[Cemtk6246]

Hello,
i have a integration test with a custom sftp testcontainer. In this integration test i can connect to the container and the first test runs threw without any issues. But all other test fail with the exception code 4. When i debug the connection is still established i can use pwd() but the commands cd() and ls() are not working. After investigating I saw that this method causes the issue:

private byte[] _realpath(String path) throws SftpException, IOException, Exception {
    sendREALPATH(Util.str2byte(path, fEncoding));

    Header header = new Header();
    header = header(buf, header);
    int length = header.length;
    int type = header.type;

    fill(buf, length);

    if (type != SSH_FXP_STATUS && type != SSH_FXP_NAME) {
      throw new SftpException(SSH_FX_FAILURE, "");
    }
    int i;
    if (type == SSH_FXP_STATUS) {
      i = buf.getInt();
      throwStatusError(buf, i);
    }
    i = buf.getInt(); // count

    byte[] str = null;
    while (i-- > 0) {
      str = buf.getString(); // absolute path;
      if (server_version <= 3) {
        byte[] lname = buf.getString(); // long filename
      }
      SftpATTRS attr = SftpATTRS.getATTR(buf); // dummy attribute
    }
    return str;
  }

did anyone find a solution to this problem except of restarting the container?