Trouble Updating Vertex Meta Properties

[Kins1]

Hello,
I seem to be having trouble trying update a property on my vertex. Other properties in the vertex update correctly, but this particular one gets ignored. The property is a VertexProperty<string>, and I'm setting its Properties to be a Dictionary<string, object>. I want to update the Properties dictionary. I've tried the following:

_g.V(id).update(thing)
_g.ReplaceV(thing)
_g.V(id).Property("dict", thing.dict)

When the object hits the API, the vertex property has the dictionary set correctly in Properties, but when I try to update the object on the graph, it never takes or it throws a connection closed exception. I wasn't able to find an example in the tests quite like what I'm trying to do. Is anyone able to point me in the write direction by chance please?
Thank you!