Expiring item cache in Nuget proxy repositories causes them to auto-block frequently

The default item max age in NuGet proxy repositories is set to 1440 minutes (I'm not sure why, artifacts should be immutable).

When it expires for a a path Nexus issues a request to the remote to check for updates. Unfortunately, it uses the full path of the artifact, e.g.:

http://localhost:8081/nexus/service/local/nuget/nuget-repo/Extended.Wpf.Toolkit/2.2.0/Extended.Wpf.Toolkit-2.2.0.nupkg

This doesn't work for NuGet feeds, it results in a 400 response. This 400 response causes the repository to auto-block.

Note that the initial download of an artifact doesn't do this (even if the full path is requested through the proxies /content URL), it uses the right path for NuGet:

http://localhost:8081/nexus/service/local/nuget/nuget-repo/Extended.Wpf.Toolkit/2.2.0/