So apparently this is an “intended” design:
If you use the out of the box “Cockpit” widget in the new Home’s Summary Ribbon and open any CTA report like “CTAs due this week” you cannot open any of the CTAs. Funny enough you can close them, but because of the needlessly limited real estate you can hardly read the name of the CTA. The widget feels hardly usable and not at all actionable.

Please allow users to open the CTA from this window.