Setup Project VS2019 Primary Output is not showing EXE file (DotNet5)

Question

I'm not sure if DotNet 5.0 is fully supported in Visual Studio 2019 version 16.9.4, but the Setup Project does not quite work for Winforms DotNet 5.0 . The Primary Output is showing only a DLL, and not an EXE (where it is clearly built and in the /bin/release/net5.0-windows/ folder).

I've created dozens of setup projects in the past, and am 100% positive I'm doing everything as I've done for years. It works fine for DotNet 4.8 projects.

I can't find any answers at Microsoft's site nor any forum I've looked at so far (all the info is for the preview editions of DotNet5 but nothing recent). Are there any workarounds for this bug/feature?