`namedProperties` doesn't seem to work with **some** terrain objects:
{F2435732}
You can see that the return value is empty, while it is clear that the object does have a property: `["map", "tree"]` or `["class", "treeXXX"]` (due to being found by `nearestTerrainObjects`)
A simple object based on that object's model works correctly:
{F2435735}