Polywall can show only the half of available hardware source instances.
Polywall uses special capture mechanism for showing Datapath hardware sources feedback in Designer.
Enable common capture mechanism for Datapath hardware sources.
Open "C:\Program Files (x86)\Polywall\Polywall Visualizer 2.0\Configuration.xml" in Notepad++ or another text editor.
Find <DatapathCustomPreview>true</DatapathCustomPreview> and change true on false.
Restart Visualizer. Check the operability.
Unfortunately the feedback in Designer for hardware sources could stop working but not necessarily.