Problems loading from __DATA__ section with Mojo::Loader

ldtest.pl

use strict;
use warnings;
use v5.10;

# this script should never give you the "Error (undef)" line.
# however, and depending on where you run it, you will get it time to time.
# For instance, running this on my macbook (perl 5.28.1, Mojolicious 8.14):
#
# $> for i in {1..20};do perl ldtest.pl;done
# # 3: Error (undef)
# # 2: Error (undef)
# # 1: Error (undef)
# # 5: Error (undef)
# # 3: Error (undef)
# # 2: Error (undef)
# # 3: Error (undef)
# # 2: Error (undef)
# # 2: Error (undef)
# # 3: Error (undef)
# # 2: Error (undef)
# $> 


use Mojo::Loader qw /data_section/;

for my $i (1 .. 6) {
  next if fork;
  say "# $i: Error (undef)" unless defined data_section('main', 'myfile');
  exit(0);
}

wait();

__DATA__
@@ myfile
some data