ListView default GroupHeader differences in Xamarin Forms 1.3.3 & 1.4

Hello,

I recently updated my Xamarin.Forms assemblies to 1.4 (from 1.3.3), and I couldn't help but notice default ListView group headers changed on iOS. In the older version, they were thinner, giving them a more native-like look. Now, they have the height of a standard cell. Is there any way to revert this?