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use strict;
...

my $perl = "C:/perl-5.34.0/bin/MSWin32-x64-multi-thread/perl.exe";
system $perl, '-wle', 'print unpack("H*", $p)';

9a999999999999990040000000000000

Use of uninitialized value $_ in print at -e line 1.

system $perl, '-wle', 'print $ARGV[0]', unpack('H*', $p);