I'm using SfTabView to host a total of 5 Tabs each with a different ListView withing. Those ListViews are bound to ObservableCollections. If I leave away the SfTabView part in my XAML and only use a ListView as ContentPage.Content the ListView is updating as it should when I add items.
If it is inside a SfTabView, I have to leave the page and enter the Page hosting the SfTabView again to make the changes visible. Since it's working withoug SfTabView I think it may be a issue with SfTabView.
I'll attach some code to help troubleshoot.