Also note the change from `songSelect.ChildrenOfType<>()...` to
`this.ChildrenOfType<>()...` - because the new design is registered at
game-level, the mod select is not a child of the song select screen
anymore.
In a very rare case, the randomisation may cause all users to be on one
team, causing a test failure. The odds make it basically impossible, but
if adjusting the number of users in the test scene this can more readily
be hit.