I expect this test script to print '850' for milliseconds using the CLDR format 'SSS', but it doesn't. What's wrong?

#!perl

use v5.16;
use strict;
use warnings;

use DateTime::Format::Epoch; # For parser
use DateTime::Format::CLDR;  # For formatter
use Math::BigInt;

my $epoch = DateTime->new(
    year       => 1601,
    month      => 1,
    day        => 1,
    hour       => 0,
    minute     => 0,
    second     => 0,
    nanosecond => 0,
);

my $parser = DateTime::Format::Epoch->new(
    epoch => $epoch,
    unit  => 1e7, # Hundreds of nanonseconds
);

my $timestamp = Math::BigInt->new('0x01_CD_F5_A9_75_38_2F_DF');

# This prints 130030072428507103, which is correct
say $timestamp;

my $dt = $parser->parse_datetime($timestamp)
                ->format_cldr('yyyy-MM-ddTHH:mm:ss.SSS');

# This prints 2013-01-18T18:27:22.000, not 2013-01-18T18:27:22.850
say $dt;

exit 0;
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