A non-collectible assembly may not reference a collectible assembly.

[ordinaryorange]

If I run the exact usage example in Linqpad I get the above error.
Works no probs in a VS console app.

I can get around it by enabling the Linqpad option "Use a non-collectable load context for this query", but I'm keen to know why a non-collectable load context is required and if it is a MessagePack.FharpExtensions thing or a MessagePack-CSharp thing ?