I’m still getting the same generated.h errors even after updating 4.20.3, cleaning my project and deleting my intermediates/saved folders, and adding the edits that you mentioned 
Anybody have any other ideas? It takes over four hours for me to rebuild my project and recompile all the shaders, so having to repeatedly do this every time a “fix” is issued is pretty frustrating. I’ve just given up on intellisense at this point.
Edit:
I’ve tried running the python script on Python 3.7 but I’m getting this error:
…line 62, in
_solution_file = glob("*.sln)[0]
indexError: list index out of range
Maybe I’m not running the python script correctly. I saved the python file to my project directory, and used the windows 10 command prompt to call the file with the python executable.