In the end, your real problem is that using  %hash in list context results in resetting the iterator in each.

Or dereferencing a reference to  %hash in list context. E.g.: 

>perl -wMstrict -le
"my %hash = qw(a 1  b 2  c 3);
 my $hashref = \%hash;
 ;;
 for (1 .. 3) {
   my ($k) = each %$hashref;
   print qq{'$k' => '$hashref->{$k}'};
   my @ra = %$hashref;
   }
"
'c' => '3'
'c' => '3'
'c' => '3'

[download]

Comment out the
    my @ra = %$hashref;
statement for more-expected behavior.

In reply to Re^2: subroutine reference parameters by AnomalousMonk
in thread subroutine reference parameters by dnajjar

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