SDK-diff test is failing in main

[NikolaMilosavljevic]

Build

Expected file '/mnt/vss/_work/1/s/artifacts/bin/Microsoft.DotNet.SourceBuild.Tests/Release/assets/SdkContentTests/MsftToSbSdkFiles.diff' does not match actual file '/mnt/vss/_work/1/s/artifacts/TestResults/Release/UpdatedMsftToSbSdkFiles.diff`.  
diff --git a/mnt/vss/_work/1/s/artifacts/bin/Microsoft.DotNet.SourceBuild.Tests/Release/assets/SdkContentTests/MsftToSbSdkFiles.diff b/mnt/vss/_work/1/s/artifacts/TestResults/Release/UpdatedMsftToSbSdkFiles.diff
index f202736418a..9a92d3a31c0 100644
--- a/mnt/vss/_work/1/s/artifacts/bin/Microsoft.DotNet.SourceBuild.Tests/Release/assets/SdkContentTests/MsftToSbSdkFiles.diff
+++ b/mnt/vss/_work/1/s/artifacts/TestResults/Release/UpdatedMsftToSbSdkFiles.diff
@@ -45,7 +45,7 @@ index ------------
  ./packs/Microsoft.NETCore.App.Ref/x.y.z/
  ./packs/Microsoft.NETCore.App.Ref/x.y.z/analyzers/
 @@ ------------ @@
- ./packs/NETStandard.Library.Ref/x.y.z/ref/netstandard2.1/System.Xml.XPath.XDocument.dll
+ ./packs/Microsoft.NETCore.App.Ref/x.y.z/ref/netx.y/WindowsBase.dll
  ./sdk-manifests/
  ./sdk-manifests/x.y.z/
 -./sdk-manifests/x.y.z/

[NikolaMilosavljevic]

Working on a fix.