Preupgrade_fixups and Postupgrade_fixups sql files not fixing the findings

we are upgrading our database from 12.2 to 19c, After running Preupgrad,jar file, Preupgrade_fixups and Postupgrade_fixups.sql files are generated.

When I executed Preupgrade_fixups.sql, my expectation si that it will fix the errors identified, but its not even fixing the memory size error also.

Update NUMERIC INITIALIZATION PARAMETERS to meet estimated minimums.

      This action may be done now or when starting the database in upgrade mode

      using the 19 ORACLE HOME.

     

       Parameter                                 Currently  19 minimum

       ---------                                 ---------  ------------------

      *memory_target                             734003200          1203765248

The same was observed with POstupgrade_fixups, my expectation si that it will upgrade the timezone, but it didn't happen.