Official builds are broken with Repeated Asset entry errors

[kunalspathak]

2021-08-05T14:01:38.2376051Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'runtime.linux-arm.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2462258Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'runtime.linux-arm.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2471906Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'runtime.linux-arm64.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2476103Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'runtime.linux-arm64.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2479138Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'runtime.linux-x64.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2482069Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'runtime.linux-x64.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2483556Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'runtime.osx-x64.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2487400Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'runtime.osx-x64.runtime.native.System.IO.Ports' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2489055Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'assets/symbols/runtime.linux-arm.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2491967Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'assets/symbols/runtime.linux-arm.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2493615Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'assets/symbols/runtime.linux-arm64.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2497495Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'assets/symbols/runtime.linux-arm64.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2499335Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'assets/symbols/runtime.linux-x64.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2502240Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'assets/symbols/runtime.linux-x64.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2504473Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : Repeated Asset entry: 'assets/symbols/runtime.osx-x64.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:38.2507699Z ##[error].packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : (NETCORE_ENGINEERING_TELEMETRY=Publish) Repeated Asset entry: 'assets/symbols/runtime.osx-x64.runtime.native.System.IO.Ports.6.0.0-rc.1.21405.3.symbols.nupkg' - '6.0.0-rc.1.21405.3' 
2021-08-05T14:01:39.3061586Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error : InvalidOperationException: Duplicate entries are not allowed for publishing to BAR, as this can cause race conditions and unexpected behavior
2021-08-05T14:01:39.3063790Z D:\a\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21373.11\tools\SdkTasks\PublishBuildAssets.proj(43,5): error :    at Microsoft.DotNet.Maestro.Tasks.PushMetadataToBuildAssetRegistry.MergeBuildManifests(List`1 buildsMetadata) in 

Most likely caused by #56712.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[kunalspathak]

@ViktorHofer

[ViktorHofer]

Got fixed with e9268fb.