E24 I am not sure about weather, because I have had the google apps installed except calendar since the first day I installed graphene OS. When I didn't have calendar, it did open the graphene calendar.
However, I do know that these things were working a few days ago, and haven't since.
My main concern though, is my messaging app spawning a blank window. That's pretty annoying. It seems to happen after I download something from instagram using aero insta.
I went and made sure exploit protection compatibility mode were enabled for lawnchair and messaging, but it still happens.