Preview Parser on Flat File Import Wizard shows incorrect data

Using the "Parse Selected Row" inside of the File Source(Flat) importer ignores, blanks. I'm attaching a sample.csv.

i.e.

AgencyId,Area,CaseNumber,CaseStatusCode,CaseTypeCode
714,,,ACTI,M
The parser in the importer, will give results:
AgencyId=714
Area=ACTI
CaseNumber=M

it should be
AgencyId=714
Area=
CaseNumber=
CaseStatusCode=ACTI
CaseTypeCode=M