Empty blocknumber in header coming from txReceipt

[mattlockyer]

This line of code in the JS SDK:
https://github.com/harmony-one/sdk/blob/0ff928bc623ef7560c38c02c7ca34387653cafe5/packages/harmony-transaction/src/transactionBase.ts#L220

Potentially related to:
harmony-one/harmony#2079

Produces undefined for blockNumber in 2 scenarios:

A regular ONE token transfer
.on('receipt', ...)

const tx = hmy.transactions.newTx({
        to: address,
        value: new hmy.utils.Unit(amount).asEther().toWei(),
        gasLimit: '210000',
        shardID: 0,
        toShardID: 0,
        gasPrice: new hmy.utils.Unit('10').asGwei().toWei(),
    });

    const signedTX = await hmy.wallet.signTransaction(tx);
    signedTX.observed().on('transactionHash', (txHash) => {
        console.log('--- txHash ---', txHash);
    })
    .on('receipt', (receipt) => {
        console.log('--- receipt ---', receipt);
        const { active } = getState().harmonyReducer
        dispatch(getBalances(active))
        dispatch(updateProcessing(false))
    }).on('error', console.error)

And a smart contract method call
.on('receipt', ...)

const tx = contract.methods.purchase(active.address, index).send({
        from: active.address,
        value: new hmy.utils.Unit(1).asEther().toWei(),
        gasLimit: '1000000',
        gasPrice: new hmy.utils.Unit('10').asGwei().toWei(),
    }).on('transactionHash', function (hash) {
        console.log('hash', hash)
    }).on('receipt', function (receipt) {
        console.log('receipt', receipt)
    }).on('confirmation', async (confirmationNumber, receipt) => {
        console.log('confirmationNumber', confirmationNumber, receipt)
        dispatch(getInventory())
        dispatch(updateProcessing(false))
    }).on('error', console.error)

My fix so far is:

blockNumber = this.messenger.chainPrefix === 'hmy'
                                    ? data.params.result.Header.number
                                    : data.params.result.number;

                                console.log(data.params.result.Header)

                                if (!blockNumber) {
                                    blockNumber = '0x0'
                                }

But this doesn't explain why a header would come back with no blockNumber???

[flicker-harmony]

latest header rpc works fine, but it returns in digits format, for simple hmy. Don't remember touching it though. Can make hex format for hmy v1. Or it can be easily fixed on sdk side.