I found the error
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// OpenStreetMap CSS
osc_enqueue_style('leaflet', osc_base_url() . 'oc-content/plugins/open_street_maps/css/leaflet.css');
// OpenStreetMap JavaScript
osc_register_script('leaflet', osc_base_url() . 'oc-content/plugins/open_street_maps/js/leaflet.js');
osc_enqueue_script('leaflet');
Change to
// OpenStreetMap CSS
osc_enqueue_style('leaflet', osc_base_url() . 'oc-content/plugins/osm_maps/css/leaflet.css');
// OpenStreetMap JavaScript
osc_register_script('leaflet', osc_base_url() . 'oc-content/plugins/osm_maps/js/leaflet.js');
osc_enqueue_script('leaflet');
It works fine for me