Assembly unable to detect 1 or 2 referenced project assemblies?

Question

I have a reference to a project here named SocialMedia.Infrastructure which in turn is depended on SocialMedia.Core. When running a command to get referenced assemblies like this

Assembly.GetExecutingAssembly().GetReferencedAssemblies()

It's unable to detected the assembly for SocialMedia.Infrastructure but it is detecting SocialMedia.Core any reasons to why this is happening?

Thanks in advance!