Any explantions as to why?

uh, as you've already determined, the path is too long.

Windows doesn't support paths that long without using an extended interface Perl builtins and thus F::F::R don't use.

foreach (@subdirs){

  # declared but not used
  my $directory_current = $_;

  # later
  my @files = $rule->in( @subdirs );
  
}
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