Steps to reproduce:

1. Create an item and add the following preprocessing steps:
   
2. Test all steps with this data set:

   LISTENER,/apps/12.2.0.1/grid
   LSNRCOMMON,/apps/oracle/product/12.1.0.2/12cr1sid_1
   

Result:
In 7.4.3, header lines are interpreted as with "With header row checkbox" marked, despite the fact box is unticked:

In 7.0.17