Docker (and other tools) appear to not properly convert directory symlinks on either docker build+COPY . . or docker cp to a running container
git clone, by default, for file symlinks it copies the data to both source and target files and for directory symlinks it creates empty files instead of a directory
git clone -c core.symlinks=true recreates file and directory symlinks correctly but is not the default
tar.exe creates tar but when extracted, the symlink is an empty file (same for ustar, pax formats)
mkdir foo
mklink /d foo\bar ..
# Symbolic link created for foo\bar <<===>> ..
dir foo\
# ...
# 05/13/2020 02:08 PM <SYMLINKD> bar [..]
# ...
dir foo\bar\
# <shows output>
tar cf foo.tar foo
rmdir /s /q foo
tar xf foo.tar
dir foo\
# ...
# 05/13/2020 02:03 PM 0 bar
# ...
dir foo\bar\
# File Not Found
git clone -c core.symlinks=true https://github.com/greenhouse-org/buildpacks-lifecycle.git