Here a version with Data::Dumper which is core. (though Data::Dump is always my first installation)

use strict;
use warnings;
use Data::Dumper;
use Test::More;


sub uniq_nds{
    # uniqe nested data-structures
    my %seen;
    local $Data::Dumper::Sortkeys = 1;
    local $Data::Dumper::Terse    = 1;
    grep { not $seen{Dumper $_}++ } @_;
}

my @test_data = (
    { Tag1 => 1, Tag2 => "a" },
    { Tag1 => 1, Tag2 => "a" },
    { Tag1 => 1, Tag2 => "b" },
    { Tag1 => 1, Tag2 => "c" },
    { Tag1 => 1, Tag2 => "a" },
    { Tag1 => 2, Tag2 => "a" },
    { Tag1 => 2, Tag2 => "d" },
    { Tag1 => 2, Tag2 => "a" },
    { Tag1 => 3 },
    { Tag1 => "sun", Tag2 => "a" },
    { Tag1 => "sun", Tag2 => "a" },
);

my $got = [ uniq_nds @test_data ];

my $expected = [
    { Tag1 => 1, Tag2 => "a" },
    { Tag1 => 1, Tag2 => "b" },
    { Tag1 => 1, Tag2 => "c" },
    { Tag1 => 2, Tag2 => "a" },
    { Tag1 => 2, Tag2 => "d" },
    { Tag1 => 3 },
    { Tag1 => "sun", Tag2 => "a" },
];


is_deeply(
    $got,
    $expected,
    'uniq AoH'
) or diag Dumper $got;


        
    
done_testing;
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