Remote Debugging of a .net core project that points to an .NET 4.8 executable doesn't work

**Visual Studio Version**:
2019 latest
**Summary**:
* Setup remote debugging of a .net core application or library
* Select a custom executable path which is a full framework executable
* start debugging
* the debugger tries to attach the .net core clr debugger to the .net 4.8

**Expected Behavior**:
- The debugger is attached and I can step through the .net 4.8 application
**Actual Behavior**:
- The debugger seems not to be attached

There seems to be an assumption that the custom debugging executable of a .NET core project must be a .net core application, too.