PATCH payloads using the cashBankBranches REST API incorrectly deletes the 'Bank Branch Type' value

Summary:

Has anyone successfully updated Bank Branch Type values using the cashBankBranches REST API?
If a Bank Branch Type value already exists, like 'Other', and the PATCH payload contains a different Bank Branch Type value, like 'ABA', 'Other' is removed and 'ABA' is not populated despite the payload response clearly displaying the new value as 'ABA'. The column is blank in the Fusion UI and the value has been removed from the CE_INDEX_BANK_BRANCHES table.

Note, the same behaviour occurs if the Bank Branch Type is null and the user is attempting to update it with a new value. It remains null, but reports a successful upload. If the PATCH payload contains the same value, it is untouched and remains in place.