[BUG] Packing a nupkg with SkiaSharp 2.80.x fails due to some missing manifest file

[samtun]

Description

I am trying to pack a class library project which references SkiaSharp.Views.Forms.
Doing so via msbuild -t:pack does result in the error shown below, expecting some kind of manifest.
With version 1.68.3 of SkiaSharp this worked just fine.

Creating the missing manifest file manually in the expected location fixes the process, but that's not really a fix.

Expected Behavior

The package can be packed just like before.

Actual Behavior

The pack process fails in the last step with the following error message:

".../SkiaSharpAppiOS/SkiaSharpAppiOS/ClassLibraryiOS/ClassLibraryiOS.csproj" (pack target) (1) ->
(GenerateNuspec target) -> 
  .../.nuget/packages/nuget.build.tasks.pack/5.6.0/build/NuGet.Build.Tasks.Pack.targets(198,5): error : 
  The file '.../SkiaSharpAppiOS/SkiaSharpAppiOS/ClassLibraryiOS/bin/iPhoneSimulator/Debug/Native.ClassLibraryiOS.manifest' to be packed was not found on disk. 
  [.../SkiaSharpAppiOS/SkiaSharpAppiOS/ClassLibraryiOS/ClassLibraryiOS.csproj]

Basic Information

• Version with issue: 2.80.x
• Last known good version: 1.68.3
• IDE: Jetbrains Rider
• Platform Target Frameworks:
  • iOS: Xamarin.iOS
• Target: Nuget package

Reproduction Link

Created a minimal setup to test this (see the readme for detailed instructions):
https://github.com/samtun/SkiaSharpPack

[maxkatz6]

Original issue is this dotnet/msbuild#4584