windows: 1.16 build with msvc variant and python 3.8 fails on vsintegration recipe

Property sheets files were sucessfully created in c:/gstreamer/1.0/x86_64/share/vs/2010/libs
Recipe 'vsintegration-1.0' failed at the build step 'install'
Traceback (most recent call last):
  File "C:\MinGW\msys\1.0\home\aaron\src\cerbero2\cerbero\build\oven.py", line 166, in _cook_recipe
    loop.run_until_complete(stepfunc(recipe))
  File "C:\Python38\lib\asyncio\base_events.py", line 616, in run_until_complete
    return future.result()
  File "C:\MinGW\msys\1.0\home\aaron\src\cerbero2\cerbero\build\recipe.py", line 52, in wrapped
    ret = stepfunc()
  File "C:/MinGW/msys/1.0/home/aaron/src/cerbero2/recipes/vsintegration-1.0.recipe", line 52, in install
    shutil.copytree(datapropsdir, propsdir)
  File "C:\Python38\lib\shutil.py", line 554, in copytree
    return _copytree(entries=entries, src=src, dst=dst, symlinks=symlinks,
  File "C:\Python38\lib\shutil.py", line 492, in _copytree
    copytree(srcobj, dstname, symlinks, ignore, copy_function,
  File "C:\Python38\lib\shutil.py", line 554, in copytree
    return _copytree(entries=entries, src=src, dst=dst, symlinks=symlinks,
  File "C:\Python38\lib\shutil.py", line 462, in _copytree
    srcname = os.path.join(src, srcentry.name)
  File "C:\MinGW\msys\1.0\home\aaron\src\cerbero2\cerbero\hacks.py", line 67, in join
    return '/'.join(args)
TypeError: sequence item 0: expected str instance, nt.DirEntry found

Build was successful when I dropped back to python 3.7