In a map e.g. in article Nesterow on the right side the location of a town is marked in an image.
When I click on the map/image to enlarge it the point is not drawn any more:
I use Firefox 87.0 on Linux but the bug is there for years. I tested it also on Windows10 Prof., with Firefox and Edge browsers.
Perhaps this is a feature and no bug, but it is strange behaviour.