bpo-45582: Fix test_embed failure during a PGO build on Windows by neonene · Pull Request #30014 · python/cpython
PGO-instrumented _testembed.exe and getpath.py often miscalculate the prefix path, when launched with all PYTHON* envvars removed.
The new path calculation uses VPATH, which is defined as "..\\.." in pythoncore.vcxproj. From PGO-instrumented folder, VPATH needs to be "..\\..\\.." to resolve prefix.