How to represent a point on the map?

My problem was fixed by adding zoomControlPosition => topleft in the definition of my HOOK_leaflet_map_info().

function my_module_leaflet_map_info() {
  return [
      'my_map' => [
        'label' => 'My Argentine map',
        'description' => t('...'),
        'settings' => [
          // ...
          'zoomControlPosition' => 'topleft',
          // ...
        ],
      ],
      'layers' => [ ... ],
      'plugins' => [ ... ],
    ],
  ];
}

The following code works correctly in my case and marks three points on my map

$map_features = [
  0 => [
    'type' => 'point', 
    'lon' => '-60.292969', 
    'lat' => '-36.315125'
  ],
  1 => [
    'type' => 'point', 
    'lon' => '-63.632813', 
    'lat' => '-32.287133'
  ],
  2 => [
    'type' => 'point', 
    'lon' => '-65.566406', 
    'lat' => '-37.195331'
  ],
];

$map_info = \Drupal::service('leaflet.service')->leafletMapGetInfo()['my_map'];
$build['map'] = \Drupal::service('leaflet.service')->leafletRenderMap($map_info, $map_features, '450px');