Currently, we are expecting the textureCoordinates list to be non null (not none)
In this case, I would suggest setting it to an empty list.
We probably could do a better job of communicating these requirements/validating objects better, especially on the SpecklePy side. We don’t do a great job of enforcing/documenting which properties need to be set and which ones don’t!
While we are at it, I would also suggest ensuring the colors list is initialized as an empty list also.
And setting units to one of these values.