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Created attachment 23285 [details]
Reproduction sample project
When trying to make a adaptive two-column view, the UWP group headers of listview turns blank unexpectedly.
The project contains a MainPage and a Page1. It automatedly navigates to Page1 when width is greater than 700 and navigates back to MainPage if width is less than 700.
However, in the UWP project, the group headers of listview disappears after some navigations (resize the window to test this).
I ran the attached project and was able to reproduce the issue. I tested with the latest pre-release and nightly and the issue was worse there. With those versions the group header was not even visible because of the margin on the Label.
So I think this might actually be an issue with the margin because if I remove it then the issue does not occur. Likewise, if I wrap the Label in a StackLayout with the Padding set, this also does not experience the issue. So this is a possible workaround in the meantime.
### Version Test