Doesn't look like this was a big issue for most people, but I can report that it is fixed in the latest Support Assist.  Once installed, you can now remove the eol .NET v5 which is no longer supported by MS and SA will still run with .NET v6.  .  
.NET runtime v5 is now officially eol and MS asks us to upgrade to v6 which continues to be supported.  However apparently SA is hard coded to look only for v5 and will not work with v6.  Please advise. 
MS recommends we uninstall .NET runtime v5 and replace with v6. Breaks SA.