Describe the Bug

It seems that .xml documentation files are missing from the latest release.

Steps to Reproduce

• Download nuget package from nuget.org
• Extract content
• Check lib/netxxx directories: there is no .xml files.

Expected Behavior

There should be .xml documentation files.

Version Info

4.20.72

Additional Info

<GenerateDocumentationFiles> is set in Directory.Build.Targets but does not seems to have any effect on package.