Did your launcher build have Editor Symbols for Debugging checked?
I tried as well with them included and still got Source Not Available.
Just wondering if there’s some other trick to it.
I’m currently compiling an Installed Build based on 4.27.2 source with full debug info, so I guess I’ll find out, but I still think it’d be useful info since decent AGDE threads are few and far between.
Guess I should also try AGDE with a source non-installed build.