> The icon is originally 75 pixels wide, scaled down here. It appears
> that Chrome (or the GoogleMaps javascript?) is using the original icon
> size for hit testing.

Yes, it is doing what you tell it to.
Your CreateMarkers() makes a MarkerImage object , with a 75x61
image.
When you create actual markers, that is used as the marker icon.
No shape is given in the marker constructor options, so markers will
be created with 75x61 clickable shape by default.
Later on, you call onZoomChanged(), which uses the marker's .setIcon
method to change the image.
That doesn't change the clickable shape, which is left at the original
75x61

You might want to investigate the .setShape method and MarkerShape
object

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