Reported by https://discuss.elastic.co/t/vega-ems-problems-using-ems-map-world-countries/302507

To view problem:

• Create new vega visualization
• Set script to

  {
    $schema: https://vega.github.io/schema/vega/v5.json
    config: {
      kibana: {type: "map"}
    }
    data: [
      {
        name: world_countries
        url: {
          %type%: emsfile
          name: World Countries
        }
        format: {property: "features"}
      }
    ]
  }
  

Vega implementation switched from leaflet to maplibre in 7.12.0. This may be a good place to start to look where regression was introduced.