XY Background Image is missing in Inline Map View

I have a simple setup:

Parent Table with [Image] column
Child Table with [XY] column

The Background Image for [XY] is the image from the parent table.
Working perfect.

In the Parent’s Detail View, I see the Related Pins as an inline map view.
image

But when there is no Pin added, the background image is missing. Instead of that I see a world map.
This is very confusing.
image

Adding @nico @Grant_Stead @hugheshilton

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