DocuSign to Salesforce Mapping Ignores Cleared/Empty Field Values on Writeback

We are experiencing an issue with the Salesforce and DocuSign integration related to updating email fields.

Current Setup:

• Salesforce has two email fields:
  • Primary Email (Required)
  • Secondary Email (Optional)
• Both fields are initially populated by Salesforce users.
• We send a DocuSign form that includes both email fields.

Example:

• Primary Email: test111@gmail.com
• Secondary Email: test222@gmail.com

Observed Behavior:

1. If the signer updates the Secondary Email (for example, changes it to test333@gmail.com), the updated value is successfully synced back to Salesforce.
2. However, if the signer clears the Secondary Email field and submits the form with it left blank, Salesforce still retains the old value (test222@gmail.com). The field is not updated to null or blank.
3. The Primary Email field is mandatory, so this issue only affects the optional Secondary Email field.

Expected Behavior:
If the signer removes the Secondary Email value in DocuSign and completes the form, the corresponding Salesforce field should be updated to blank (null), removing the existing value.

Environment:

• Salesforce
• DocuSign eSignature for Salesforce
• Using a DocuSign Developer Account

Could you please confirm whether this is expected behavior, a known limitation, or a bug? If this is expected, is there any configuration or mapping option that allows blank values from DocuSign to overwrite existing Salesforce values?

Thank you.