First item content doesn't update when starting with an empty ObservableCollection even though an indicator is present.

Steps to repro:

1- Starting with an empty ObservableCollection<T> ItemsSource 
2 - Add two items (notice 1st item's content stays empty)
3 - Slide to the 2nd item (notice content is visible)
4 - Slide back to 1st item (notice content is now visible)

Attached a runnable repro.

Available in minor release 2018.1.405. It will also be available in the R2 2018 release.