coverlet nuget package metadata for assemblies is missing/invalid

[Bertk]

Describe the bug
Nuget explorer is not able to show assemblies metadata for coverlet nuget packages downloaded from nuget.org

To Reproduce
Download a coverlet nuget package from nuget.org e.g. coverlet.msbuild and open it with nuget package explorer. Double-click name of an assembly e.g. System.Buffers.dll

Expected behavior
Repeat the To Reproduce steps but download a [coverlet nightly build nuget package] The metadata is available.
(https://dev.azure.com/tonerdo/coverlet/_artifacts/feed/coverlet-nightly/NuGet/coverlet.msbuild/overview/6.0.3-preview.6.gcf40840873).

[Bertk]

The assembly metadata is available within the internet browser using "Open in Nuget Package Explorer" from nuget web page.