Hello @Sage.Hlavacek - Apologies you have hit this issue 
We are going to ship a new version of MeshToolkit that will resolve this issue. The underlying dependencies for Mesh Toolkit are now also a dependency in the geometry kernel we use, so there is a conflict.
We are actively working on a .NET 6 migration right now that takes priority (If we don’t - there won’t be a Dynamo next year. Think this happening to the entire system, not just Mesh Toolkit nodes), and plan to slot in this package upgrade as soon as we have bandwidth 
We’re hoping this can happen in the next couple of weeks. In the meantime, what are you looking to use this node (Or other Mesh Toolkit) nodes to do?