Qt Vs Tools projects are built *twice* on fresh build

Whenever I "Rebuild" or "Clean/Build" a Qt Vs Tools project - it builds twice.

 Could this be related to linking bug 708,_ when exports are missing in the link step on the rebuild?

Replication steps:

1) Start Vs 2019

2) Click "Create New Project"

3) Choose "Qt Console Application"

4) Accept defaults, create the project

5) Set up the Post-Build Event:

6) Build. Note that Post-Build Event is executed twice:

 7) Build again (not Rebuild):

This time the Post Build event is only executed once, as expected