CustomerCampaignService readFiltered returns 0 as businessLocationId

This bug blocks building out site links as this is the only call (I know of) which associates BA and BLs

// soap request

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:con="http://thesearchagency.com/smb/core/content_model">
<soapenv:Header/>
<soapenv:Body>
<con:readFiltered>
<!-Optional:->
<entityId>917</entityId>
<!-Zero or more repetitions:->
<filter>
<!-Optional:->
<field>BUSINESS_AREA</field>
<!-Optional:->
<value>2000084</value>
<negative>false</negative>
</filter>
</con:readFiltered>
</soapenv:Body>
</soapenv:Envelope>

// soap response

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<ns2:readFilteredResponse xmlns:ns2="http://thesearchagency.com/smb/core/content_model">
<CustomerCampaign entityId="917" customizableEntityParentId="1395" id="1397" description="Residential Building Construction in Richmond - Tweed" type="CUSTOMER_CAMPAIGN">
<businessLocationId businessLocationId="0"/>
</CustomerCampaign>
</ns2:readFilteredResponse>
</soap:Body>
</soap:Envelope>

I would expect the businessLocationId to be valid (in this case, 59)