I'm afraid I can't select any custom icons for a marker

[astridx]

I'm afraid I can't select any custom icons.
The icons are not displayed for selection but only the placeholder.

Is this a bug or do I have to adjust something?

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This is a problem in some browsers. In Firefox, for example. I haven't found a solution yet.

You can select the icons. Unfortunately, only the images are not displayed and you have to guess which icon it is. After the selection, the correct image appears in the drop-down.

In Google Chrome the images are displayed correctly.