AreaSeries disapears when zomming in

[Enigma86d]

Steps to reproduce

1. Create a Xamarin forms project targeting at least UWP.
2. Create a PlotModel and an AreaSeries with a fill color and add certain points
3. Add the AreaSeries to the PlotModel and run the app in Windows.

Details:
Visual Studio 2019 Version 16.5.1
.NET standard 2.0 (I was not able to make it run using 2.1)
Nuget:
Xamarin.Forms v5.0.0.2012 (latest)
Xamarin.Essentials v1.6.1
OxyPlot.Xamarin.Forms v1.1.0-unstable0011 (tried 1.0.0 as ell)
NETStandard.Library v2.0.3
Microsoft.NETCore.UniversalWindowsPlatform v6.2.12

Expected behavior: the area series should remain visible if zooming into it (the fill color should remain on the screen

Actual behavior: the fill color disappears from the screen
Print screens show expected behavior if drawing a square.
However, if drawing an odd shape, the fill color disappears after zooming in.

A few things which I am not sure about and don't know if could be related to the issue. As soon as I add OxyPlot to a new Xamarin Forms project I get a few warnings like the below one and I don't know how to resolve them and if they are a concern:
Severity Code Description Project File Line Suppression State
Warning NU1701 Package 'OxyPlot.Xamarin.Forms 1.1.0-unstable0011' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project. OxyPlotTest C:\Users\Marius\Desktop\OxyPlotTest\OxyPlotTest\OxyPlotTest.csproj 1
Trying .NET standard 1.6 or 2.1 brings compatibility errors.

OxyPlotTest.zip

[Enigma86d]

This issue appears on Android as well (not just UWP).
It's there any fix/workaround for this?
Thanks