NuGet Package does not contain a manifest

Reproduce the upload using Microsoft.Web.LibraryManager.Build versions 2.0.76 or 2.0.96 and the documented NuGet.Server setup, then inspect the reported PackageHelper.GetManifestStream and PackageFactory.Open stack trace. Done means identifying whether the package or NuGet.Server is responsible and restoring a successful push with the documented nuget command.

Hello,

for our internal build and deploy, we have set up our own NuGet server as described in
https://docs.microsoft.com/en-us/nuget/hosting-packages/nuget-server

Using NuGet.Server version 3.4.1 including latest versions of all dependencies, behind an Microsoft IIS 7 server.

To this server, I am unable to upload the package
Microsoft.Web.LibraryManager.Build
from
https://www.nuget.org/packages/Microsoft.Web.LibraryManager.Build/
(tested with version 2.0.76 and 2.0.96).
I receive the error message described below.

Because this is the only package, where this error occurs, I believe it is an error in the package itself, not in the NuGet.Server. So I created the issue here in this project.

Best regards
Daniel

Functional impact

Unable to use the package "Microsoft.Web.LibraryManager.Build".

Minimal repro steps

1. Download the NuGet package from the official gallery:
   https://www.nuget.org/packages/Microsoft.Web.LibraryManager.Build/

2. Try to push it to the own server, e.g.
   nuget push microsoft.web.librarymanager.build.2.0.76.nupkg -src http://localhost

Expected result

Package should be pushed to the NuGet Server.

Actual result

Error message in client:
Return code 406 (Not Acceptable)

Error message in log file of the server:

w3wp.exe Error: 0 : System.InvalidOperationException: Package does not contain a manifest.
   bei NuGet.PackageHelper.GetManifestStream(Stream packageStream)
   bei NuGet.OptimizedZipPackage.EnsureManifest()
   bei NuGet.Server.Core.PackageFactory.Open(String fullPackagePath)
   bei NuGet.Server.V2.Controllers.NuGetODataController.<UploadPackage>d__16.MoveNext()
...