getClaimableBalanceId returns incorrect id

[eugene3141]

Describe the bug
getClaimableBalanceId returns incorrect id

What version are you on?
Stellar Base v8.0.0

To Reproduce

let sdk = require("stellar-base");
/*
sourceAccount = GALAXYVOIDAOPZTDLHILAJQKCVVFMD4IKLXLSZV5YHO7VY74IWZILUTO
seqNum = 114272277834498050
opNum = 0
*/
let xdr = 'AAAAAgAAAAAWC+KuQMDn5mNZ0LAmChVqVg+IUu65Zr3B3frj/EWyhQAAA+gBlfoIAAAAAgAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAADgAAAAAAAFrzEHpAAAAAAAEAAAAAAAAAABYL4q5AwOfmY1nQsCYKFWpWD4hS7rlmvcHd+uP8RbKFAAAAAAAAAAAAAAAA';
let tx = new sdk.TransactionBuilder.fromXDR(xdr, sdk.Networks.PUBLIC);
let cbId = tx.getClaimableBalanceId(0);
console.log(cbId);

The function returns 000000007f156aacadf4101a920a45e312707bbf06323f79536f6b0f18afd874617f181a.

Expected behavior
With the same arguments, Stellar Python SDK returns 000000000321fe4ccc0027b330c23f3a9a4720bea524ee9e319d37deaa49c071da8a2659, which is the correct id.