Ok. Here is my code:

use strict;
use warnings;
use Log::Log4perl qw(:easy);
use WWW::Mechanize::Chrome;
 
Log::Log4perl->easy_init($ERROR);
my $mech = WWW::Mechanize::Chrome->new();
$mech->get('https://metacpan.org/');
my $file_map = $mech->saveResources_future(
    target_file => 'this_page.html',
    target_dir  => 'this_page_files/',
    wanted      => sub { $_[0]->{url} =~ m!^https?:!i },
)->get();
[download]

Yes, indeed that helps! Thank you very much!

The code in 0.54 had the logic for the wanted subroutine partially wrong and it didn't properly pass the callback on to where it actually matters.

I've released version 0.55, which downloads several files in your test case, and puts them all below the this_page_files/ directory, except for the main page.

Wonderful! This works great. Thank you very much again for your time, work and support. And the wanted-feature is very help- and useful.
Now I know that you like to have code ;) Next time I will try to express myself right away with some code.
Best regards
1nelly1