[BUG] new assembly metadata of #3038 breaks build

[BerndStoltefuss]

Description

Latests ci build including the "feat: Add IsTrimmable False metadata to assembly" breaks build in publish mode.

Steps to Reproduce

1. Create a maui app using latest ci builds of prism.
2. build app with "dotnet publish" (without PublishTrimmed=FALSE in the project file)

Platform with bug

.NET MAUI

Affected platforms

iOS, I was not able test on other platforms

Did you find any workaround?

Rollback to a pre january version of prism as disabling trimming is not possible for iOS.

Relevant log output

Fehler beim Buildvorgang.

       "/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid.sln" (Publish Ziel) (1) ->
       "/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj" (Publish Ziel) (2) ->
       (_RunILLink Ziel) -> 
         /Users/jenkins/.nuget/packages/prism.container.abstractions/9.0.80-pre/lib/net8.0/Prism.Container.Abstractions.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism.Container.Abstractions'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]
         /Users/jenkins/.nuget/packages/prism.container.dryioc/9.0.80-pre/lib/net8.0/Prism.Container.DryIoc.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism.Container.DryIoc'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]
         /Users/jenkins/.nuget/packages/prism.core/9.0.349-pre/lib/net6.0/Prism.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]
         /Users/jenkins/.nuget/packages/prism.dryioc.maui/9.0.349-pre/lib/net8.0/Prism.DryIoc.Maui.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism.DryIoc.Maui'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]
         /Users/jenkins/.nuget/packages/prism.events/9.0.349-pre/lib/net6.0/Prism.Events.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism.Events'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]
         /Users/jenkins/.nuget/packages/prism.maui.rx/9.0.349-pre/lib/net8.0/Prism.Maui.Rx.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism.Maui.Rx'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]
         /Users/jenkins/.nuget/packages/prism.maui/9.0.349-pre/lib/net8.0/Prism.Maui.dll : error IL2102: Invalid AssemblyMetadata("IsTrimmable", "False") attribute in assembly 'Prism.Maui'. Value must be "True". [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]


       "/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid.sln" (Publish Ziel) (1) ->
       "/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj" (Publish Ziel) (2) ->
       (ILLink Ziel) -> 
         /Users/jenkins/.nuget/packages/microsoft.net.illink.tasks/8.0.0/build/Microsoft.NET.ILLink.targets(87,5): error NETSDK1144: Fehler bei der Größenoptimierung von Assemblys. Die Optimierung kann durch Festlegen der PublishTrimmed-Eigenschaft auf FALSE deaktiviert werden. [/Users/jenkins/slave/workspace/NWAI-ToHarvest-macpipeline8/LBS_Rapid/LBS_Rapid.csproj::TargetFramework=net8.0-ios]

[BerndStoltefuss]

As requested my csproj file LBS_Rapid.csproj.txt.
The correspondig build command is:
dotnet publish LBS_Rapid.sln -v normal -f net8.0-ios -c Release -p:ArchiveOnBuild=true -p:RuntimeIdentifier=ios-arm64 -p:CodesignProvision=LBSGoDistributionV2 '-p:CodesignKey=iPhone Distribution: LBS Go' -p:BuildIpa=true -p:SetVersion=true -p:BuildNumber=40 -p:Version=0232.101 '-p:MyConstants="NEW_PROPERTY_SYSTEM;UMG_FKT_WEITERENTW;DUMMY"'

Please note that with target iOS it is not allowed to use <PublishTrimmed>false</PublishTrimmed>.

[BerndStoltefuss]

According to dotnet/maui#18658 third party libs like prism will not be trimmed unless you opt-in with IsTrimmable=true. So the easiest solution might be to reverse the "IsTrimmable=false" change.

[dansiegel]

@BerndStoltefuss can you please provide an actual sample project that we can run and duplicate your issue. Thanks.