Hello
This is not a WinReducer bug, "Weather" app needs a SDK dependency in order to work correctly ... and it's "Modern UI Apps - Framework (Advertising SDK)".
I will add a note in the changelog ... and I will also include a component protection to avoid removing the SDK when you keep "Weather" app.
P.S. 1 : "Solitaire Collection" app is also in the same case = it needs the "Modern UI Apps - Framework (Advertising SDK)".
P.S. 2 : And even if you remove both "Weather" app and "Modern UI Apps - Framework (Advertising SDK)" ... then reinstall the "Weather" app from Windows Store, it will reinstall "Modern UI Apps - Framework (Advertising SDK)" automatically
P.S. 3 : So I consider the thread as solved (in v1.9.4.0)