The table Extent property is showing Envelope [XMin=NaN, YMin=NaN, XMax=NaN, YMax=NaN, Wkid=3857]. This is also what the FullExtent of the layer shows. I've tried with several different files. It's evident that the map can determine the full extent since it loads the layer at the full extent. In addition, I can load the layer as a dynamic map service layer and query the metadata to determine the full extent. Is there another way to get at this information when directly loading a shapefile?
Note: I see the same issue when using GeodatabaseFeatureTable