Tests in the very same console app - compilation error in .NET Core

Having unit tests in the very same console app causes a compilation error:

Program has more than one entry point defined. Compile with /main to specify the type that contains the entry point.

Kind of unexpected, there's definitely a single Main.

There problem seems to be there for all these years, despite being first described back in 2017

The solution is alread provided in the link above, just add

<GenerateProgramFile>false</GenerateProgramFile>

to the *.csproj