Non mapped fields data not getting populated on downloaded HTML form

Environment : Pre-prod

Steps:

1. Create HTML document template
2. Send to candidate
3. Candidate adds his data in non mapped fields and submits the forms.
4. Non mapped fields data populated on preview of submitted form
5. Goto completed forms library - > Download the form
6. Non mapped fields data not getting populated.

CC: Swapnil Pandhare,Ganesh Sadawarte,Komal Barde,Mohd Belal, Priya Dhamande,Jayshree Nagpure