Perl5's bless can't bless

[DarthGandalf]

use lib:from<Perl5> '../libp5/lib/perl5';
use Graph::Implicit:from<Perl5>;

my $graph = Graph::Implicit.new(sub {
	my @x;
	return @x;
});
$graph.astar(1, sub { 1 });

Implementation of Graph::Implicit::new looks like this:

sub new {
    my $class = shift;
    my $edge_calculator = shift;
    return bless $edge_calculator, $class;
} 

So it tries to bless the Sub passed to it as Graph::Implicit. But then next line in the Raku code breaks, because Sub doesn't have a method called astar: No such method 'astar' for invocant of type 'Sub'. Did you mean 'Str'?

Environment: Gentoo Linux, Rakudo v2023.10.