Projects are built again even if no change (Regression since VS 16.8)

Since VS 16.8, when I press "build solution" after a successful build it builds again the project, not the .cpp files but moc, rcc,... target build are rerun. It converges after a certain a number of hits on "build solution" which depends on the number of Qt projects in the solution.

Please find attached a simple solution containing 2 projects created with default options from the wizard from the addin. If you hit "build solution" it builds the library then the application. If you hit "build solution" again, the library is built again. Then a third hit won't trigger a build this time.

To reproduce again, clean the solution.

Expected behavior:

The second hit on "build solution" shouldn't trigger a build if the previous one was successful.