Web Library Beta: Add by Identifier is blocked because of the Content Security Policy

The add by identifier functionality in the new web library beta looks really interesting and I tried it out without any success.There is always an NetworkError resp.Error failed to fetch appearing and in the browser console I see a warning and some calls are blocked because of the Content Security Policy.The behavior is the same for me in Firefox 69 (Windows, 64-Bit) and Chrome Version 78 (Windows, 64-Bit).
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