Images inside item-set are not editable

Enonic version: 6.3.0

Consider the following extract from a content type declaration.

<item-set name="top">
        <input name="image" type="ImageSelector">
            <occurrences minimum="0" maximum="1"/>
    <occurrences minimum="0" maximum="1"/>

I create a content and upload an image file as normal. I then wish to edit the metadata, crop or focal point of this image. When I select the image from the parent content context and click the edit button, nothing happens.

If I move the ImageSelector outside the item-set element everything works as expected.

This was not a known bug. Thanks for reporting it.
It has been registered internally, it should be fixed in the up coming 6.4 release.