Build error when using LinkMode=copyused, but LinkMode=link or no-trimming works

[lauxjpn]

Android application type

Android for .NET (net6.0-android, etc.)

Affected platform version

.NET 6.0.100

Description

I have a .NET 6 android app.
When using LinkMode=link or PublishTrimmed=false the app builds fine.

When using LinkMode=copyused I get the following exception at build time:

Optimizing assemblies for size, which may change the behavior of the app. Be sure to test after publishing. See: https://aka.ms/dotnet-illink
C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\31.0.101-preview.11.117\tools\Xamarin.Android.Common.targets(1375,3): Error XALNS7028 : System.IO.FileNotFoundException: Could not load assembly 'Xamarin.AndroidX.Transition, Version=1.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'Xamarin.AndroidX.Transition.dll'
   at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters) in /Users/builder/azdo/_work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop.Tools.Cecil/Java.Interop.Tools.Cecil/DirectoryAssemblyResolver.cs:line 245
   at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference) in /Users/builder/azdo/_work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop.Tools.Cecil/Java.Interop.Tools.Cecil/DirectoryAssemblyResolver.cs:line 191
   at Mono.Cecil.MetadataResolver.Resolve(TypeReference type) in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/cecil/Mono.Cecil/MetadataResolver.cs:line 110
   at Mono.Cecil.ModuleDefinition.Resolve(TypeReference type) in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/cecil/Mono.Cecil/ModuleDefinition.cs:line 762
   at Mono.Cecil.TypeReference.Resolve() in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/cecil/Mono.Cecil/TypeReference.cs:line 278
   at Java.Interop.Tools.Cecil.TypeDefinitionCache.Resolve(TypeReference typeReference) in /Users/builder/azdo/_work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop.Tools.Cecil/Java.Interop.Tools.Cecil/TypeDefinitionCache.cs:line 20
   at Java.Interop.Tools.Cecil.TypeDefinitionRocks.GetTypeAndBaseTypes(TypeDefinition type, IMetadataResolver resolver)+MoveNext() in /Users/builder/azdo/_work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop.Tools.Cecil/Java.Interop.Tools.Cecil/TypeDefinitionRocks.cs:line 40
   at Java.Interop.Tools.Cecil.TypeDefinitionRocks.IsSubclassOf(TypeDefinition type, String typeName, IMetadataResolver resolver) in /Users/builder/azdo/_work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop.Tools.Cecil/Java.Interop.Tools.Cecil/TypeDefinitionRocks.cs:line 94
   at MonoDroid.Tuner.FixAbstractMethodsStep.FixAbstractMethods(AssemblyDefinition assembly)
   at Xamarin.Android.Tasks.LinkAssembliesNoShrink.RunTask()
   at Microsoft.Android.Build.Tasks.AndroidTask.Execute() in /Users/builder/azdo/_work/1/s/xamarin-android/external/xamarin-android-tools/src/Microsoft.Android.Build.BaseTasks/AndroidTask.cs:line 22

The library Xamarin.AndroidX.Transition is being transitively referenced with version 1.4.1.3. Explicitly referencing the assembly leads to the same exception.

I can't say for sure, whether this is an issue with the AndroidX binding or the build task, but I was under the impression that using LinkMode=copyused is the safer trimming mode and so I consider this inconsistency at build time unexpected.

Steps to Reproduce

See description.

Did you find any workaround?

Only not to use LinkMode=copyused.

Relevant log output

See description.