When dpi is smaller than 96, font in Calendar too large

Binary package hint: evolution

I changed the dpi in my Gnome desktop to 72 instead of the default 96 dpi. The font size of all fonts is set to 11, which gives me a pretty smooth desktop experience. Almost all applications know how to handle this altered dpi setting and even Evolution does it fine, except for one location, namely the calendar. The font of the day numbers (1 - 30/31) is too large on two places: the small calendars beneath the calendar list on the left and in the large calendar view in the middle of the application.

I will attach a screenshot where this problem is visible in a few seconds.