Using Match Games

[NotADuplicate]

I want to build a best of 3 tournament but I'm having some difficulty understanding the functionality of the matchGames. When I create my bracket I use:
await manager.create.stage({
tournamentId: 3,
name: 'Season 2 Playoffs',
type: 'single_elimination',
seeding: teams.map((team) => team.name),
matchesChildCount: 3,
settings: {
seedOrdering: ['inner_outer'],
size: this.getNearestPowerOfTwo(teams.length),
},
});

And yet I still don't see any matchGames, and the matches say they have a child count of 0. So I've been running this after my bracket creation:
manager.update.matchChildCount("stage",0, 3);

And that does create 3 matchgames per match in the structure, but still when I'm using the viewer I only see one match game per match in the way the bracket looks.

I have also had difficulty updating the match games, I am using the manager.update.updateMatchGame, but I don't understand how the input should be formatted such as how I should construct the deepPartial update structure. Are there any examples of a BoX tournament created with this?

[Drarig29]

Hey! The viewer doesn't support showing the content of the child games (Drarig29/brackets-viewer.js#105). You'll have to make the UI yourself if you want to show each child game.

And update.matchGame() should look the same as update.match(), except it has a parent_id: https://drarig29.github.io/brackets-docs/reference/model/interfaces/MatchGame.html