To reproduce run this command multiple times on windows:
python buildscripts/scons.py --build-profile=opt LIBPATH="C:/sasl/lib" CPPPATH="C:/sasl/include" --ninja=disabled build/opt/mongo/db/basic_types_gen.cpp

You will notice the reinstall step is always re-performed. This mostly likely is due to the use of run_shell in out poetry installer. "run_shell" is not well supported on windows: https://bazel.build/configure/windows#sh-rules-without-bash