File manager come up empty when opened from dashboard

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I have a page with a customfield-property "newsimage". I can select images if I enter the property panel when in "Edit page"-mode, but if I go to the dashboard->sitemap and open the propertypanel (and further on select image) on the same page, the file manager comes up, but without any images. All it contains is the search and upload option. How come? Is this related to security or is it a known bug?

(screenshot attached)

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