Dynamic selectablePlaceholder closure does not have the desired effect

->selectablePlaceholder(function (Get $get, ?string $state) {
  $groupId = (int) ($get('group_id') ?? 0);
  if ($groupId) {
    $singleUsers = User::query()
      ->whereHas('groups', fn($q) => $q->whereKey($groupId))
      ->limit(2)
      ->get();
    if (count($singleUsers) === 1 && $singleUsers->contains('id', $state)) {
      return false;
    }
  }
  return true;
})