Maya Plugin: Normal Maps (Tangent or World) Break in Hypershade, Cannot Be Seen In Viewport

I'm using Maya 2020 with v2.1.7 of the plugin.  Simply put, there is something wrong with the substance output node in hypershade that breaks the display of tangent space normal maps, regardless of the shader network format.  I can see the normal map in the property editor, but once it's passed on to the bump2d2 node, it breaks.  The only way to make it appear is to switch the use to "Bump" instead of tangent space normal, which makes work extremely difficult to visualize. 

What's going on here?