Lead Conversion wiping Lead Source and Lead Source Detail
We have a native Salesforce Marketo integration. Our Salesforce instance operates only on Contacts, so as soon as Marketo creates a lead and syncs it to Salesforce, the conversion process begins. That process intermittently wipes the Lead Source and Lead Source Detail values to [null]. Screenshot below. In troubleshooting I have confirmed:
- Lead (Person) Source is properly mapped from Lead -> Contact (leadsource system field)
- Marketo Sync User has appropriate permissions to the fields (Visible checked, Read-only unchecked)

Anyone been through this before?