Method that copies properties from another object moved to the BaseObject class. Not using getProperties() to avoid creating an intermediate object that is not used later

src/ol/geom/MultiPoint.js

@@ -61,7 +61,7 @@ class MultiPoint extends SimpleGeometry {
       this.flatCoordinates.slice(),
       this.layout
     );
-    multiPoint.importPropertiesFrom(this);
+    multiPoint.applyProperties(this);
     return multiPoint;
   }