Removing existing features before adding new ones.

src/components/wpt/Wpt.tsx

@@ -99,6 +99,10 @@ export const Wpt: Component<Props> = ({ vectorSource, wptId: wptId }) => {
 
       const features = new GeoJSON().readFeatures(geo);
       console.log({ caller: 'Wpt', features });
+      const feature = vectorSource.getFeatureById(wptId);
+      if (feature) {
+        vectorSource.removeFeature(feature);
+      }
       vectorSource.addFeatures(features);
     }
   });