Refund Transaction for non-taxable and taxable

For an order with taxable and non-taxable, we are sending orders together. However, for refund, we are sending them with two transactions.

And after the experiment, we know that for an order with only taxable / only non-taxable, we got refund immediately to the bank.

So, if we combine taxable and non-taxable as one component (subAmount) and request as one transaction, can we get immediate refund to the bank?
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