The marker is an external dependency

[DC92]

The marker is fetched from
//cdn.rawgit.com/jonataswalker/map-utils/master/images/marker.png

Use inline code instead as:
data:image/svg+xml;charset=utf-8, <svg width="26" height="42" viewBox="0 0 26 42" xmlns="http://www.w3.org/2000/svg"> <polygon points="1,18 14,42 25,18" fill="rgb(75,75,75)" /> <ellipse cx="13" cy="13" rx="13" ry="13" fill="rgb(75,75,75)" /> <ellipse cx="13" cy="14" rx="6" ry="6" fill="yellow" /> </svg>

[Dominique92]

Closed in https://github.com/Dominique92/ol-geocoder/releases/tag/v4.3.3