Map not rendering with ajax implementation

Problem/Motivation

When I try to display a map wiith AJAX Command (depending of choices on a form), it only renders a div like that :
<div id="leaflet-map--OwQZAsqWLCo" style="min-width: 150px; height: 400px"></div>

The same code displaying in a block, is working.

What can I do ?

My code :

    /**
     * Get the map from ws.
     */
    public function getMapWs($items)
    {
        // define map features from lat/lng
        $features = [];
        foreach ($items as $delta => $item) {
            // define map features from lat/lng
            $features[] =
                [
                'type' => 'point',
                'lat' => $items[$delta]['latitude'],
                'lon' => $items[$delta]['longitude'],
                'popup' => Markup::create($items[$delta]['nom']),
                ];
        }
        $map_service = \Drupal::service('leaflet.service');

        // set map type (default leaflet OSM)
        $settings['leaflet_map'] = 'OSM Mapnik';

        // set $map array with leafletMapGetInfo
        $map_info = $map_service->leafletMapGetInfo($settings['leaflet_map']);
        $map_info['settings']['map_position_force'] = 0;
        $map_info['settings']['zoom'] = 12;
        $map_info['settings']['zoomFiner'] = 0;
        $map_info['settings']['minZoom'] = 1;
        $map_info['settings']['maxZoom'] = 18;
        $map_info['settings']['center'] = ['lat' => 0, 'lon' => 0];
        $map_info['settings']['fullscreen_control'] = 0;
        $map_info['settings']['maxZoom'] = 18;

        $map = $map_service->leafletRenderMap($map_info, $features, '400px');

        return render($map);
    }