Column width of emoji appears incorrect

[FGasper]

use strict;
use warnings;

my @rows;

use v5.10;
use Term::Table;

use utf8;
push @rows, [ 'Contraseña', 'non-repair only' ];
push @rows, [ '密码',        'non-repair only' ];
push @rows, [ '🏄',          'surfing' ];

        for (
            Term::Table->new(
                header => [ 'Task', 'Type' ],
                rows   => \@rows,
            )->render
        ) {
            utf8::encode($_);
            say;
        }

… outputs:

+------------+-----------------+
| Task       | Type            |
+------------+-----------------+
| Contraseña | non-repair only |
| 密码       | non-repair only |
| 🏄          | surfing         |
+------------+-----------------+

The last row’s first column looks like it should have one fewer space?

[FGasper]

Interestingly, my GH/browser …

… draws this differently from my terminal (iTerm2) …

So maybe this is a Unicode-being-Unicode thing?

[FGasper]

NB: The system in question has Unicode::GCString installed.