Bug with a BYE and possibly ordering or balancing

[Drarig29]

await manager.create({
    name: 'Example',
    tournamentId: 0,
    type: 'double_elimination',
    seeding: [
        'Team 1', 'Team 2', 'Team 3', 'Team 4',
        null, 'Team 6', 'Team 7', 'Team 8',
        'Team 9', 'Team 10', 'Team 11', 'Team 12',
        'Team 13', 'Team 14', 'Team 15',
    ],
    settings: {
        size: 16,
    },
});

Two BYEs are produced with it:

[Drarig29]

Actually no, it's not a bug. The second BYE is the result of completing the seeding to a size of 16 with a BYE.

The result I wanted was the 5th seed to be a BYE and the last seed to be a TBD ("to be determined") participant.