In order to load and compile the module code, runpy calls the loader's get_code method. Because that happens outside of the normal import process, and PyImport_ImportModuleLevelObject is currently the only place where remove_importlib_frames is being invoked, tracebacks of exceptions occurring in get_code are kept unmodified.

Would it be wrong to drop all importlib frames from all unhandled exceptions, except when the -v flag is present? On the other hand, since the patch from #issue15486 seems to work fine in most scenarios, I propose removing both runpy and importlib traceback entries locally inside the runpy module. There may be better solutions, though...

In any case, I'm willing to write a patch.