TrackingOptionId value missing from accountingApi.getInvoices()

[awasser-omnispear]

SDK you're using:

• Version 13.3.0

Describe the bug
The trackingOptionID field is present in the TS definition, but the value not getting properly populated/mapped. The other three fields are populated correctly; just the option ID is missing.

To Reproduce
Call GET https://api.xero.com/api.xro/2.0/Invoice/<<invoiceID>> using Postman or the API Explorer. Target an invoice which contain lines with tracking options selected.
Call accountingApi.getInvoices() with the same invoiceID, and notice trackingOptionID is undefined.

[github-actions]

PETOSS-879

[github-actions]

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