You are probably missing a second level dependency (i.e. one or more of the DLLs you are packing depends on another DLL you are not listing).

Give pp_autolink from App::PP::Autolink a go. I just tested with the script below. It fails using a plain pp call (in the same way that your call does), but passes with pp_autolink.

use strict;
use warnings;
use XML::LibXML;

print 'done';
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