How to make cluster icons not disappear when zooming (Google Map)?

Question

JavaScript

If you change the scale of the map, then the icons of the clusters disappear for the time of zooming out/zooming in.
Under the same conditions, the usual markers on the map do not disappear.
Question: how to make cluster icons behave like regular labels when zooming. - i.e. didn't disappear.
Or that they disappear / appear after changing the scale.
An example can be found here - https://codepen.io/Alessa/pen/GobLvY

Answer 1

They do not just disappear, they are recreated - in other places, with different content.