You might gain some insight by trying to come up with a small example that demonstrates the problem. Something like

  use strict;
  use Net::SNMP;
  my $version = ".1.3.6.1.2.1.1.1.0";
  my %snmp_options = ( ... };
  $s = NET::SNMP->session(\%snmp_options);
  print $s->get_request($version);
  $s->close();
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This approach strips out extraneous detail, and should help you isolate the problem quickly.