Group does not export semver2 endpoints `RegistrationsBaseUrl/Versioned` when used as NuGet V3

When use NuGet v3, unlike nuget.org-proxy, nuget-group only exports  `RegistrationsBaseUrl/3.6.0` but not  `RegistrationsBaseUrl/Versioned` as semver2 endpoints. But seems for some unknown reason, nuget client only checks `RegistrationsBaseUrl/Versioned` but not `RegistrationsBaseUrl/3.6.0`, so it's not possible to get only semver2 only packages with nuget-group.

https://github.com/NuGet/NuGet.Client/blob/e08358296db5bfa6f7f32d6f4ec8de288f3b0388/src/NuGet.Core/NuGet.Protocol/ServiceTypes.cs

https://github.com/NuGet/Home/wiki/Semver-2.0.0-Protocol

For something like `Microsoft.EntityFrameworkCore`, it's only possible to see 3.1.x, but not 5.0.0-preview.7.20365.15 in nuget-group, and nuget.org-proxy works well.

https://www.nuget.org/packages/Microsoft.EntityFrameworkCore/5.0.0-preview.7.20365.15

And also for nuget-hosted.