Missing compiler required member 'microsoft.csharp.runtimebinder.binder.convert'

I get the above error when trying to compile with dynamic being used as a type. Dynamic has been in C# for years, and I thought maybe I messed up something with my core mods, so I tested it on a Fresh install as well.

I looked into the issue of course, and found most sites saying you just needed to add <Reference Include="Microsoft.CSharp" /> to the references, but alas after modifying the Server.csproj to include that and recompiling, it still was not working.

Does anyone know what I am missing or which file I need to actually modify to add support for the dynamic type?
 
Edit: Just to clarify, I am referring to ServUO specifically.

Is anyone else able to make use of the Dynamic type in their ServUO scripts?

p.s. If this is the wrong place for this question, please direct me to the correct place.
 
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