Get Directory failing when getting sub folders from Linux to local Windows

[robot-user-rudi]

KW "Get Directory" is trowing an error, when getting folder structure from remote Linux machine to local windows PC.
Errormessage: "WindowsError: [Error 123] The filename, directory name, or volume label syntax is incorrect: ..."

The path in the errormessage shows, that it is combining the remote folder name and the local folder name with the wrong path separator. E.g.: C:\localpath/remote_folder

Used lib: robotframework-sshlibrary 3.6.0

The error is located in the abstractclient.py, in the function build_destination.
The error get resolved for us by changing line 961:
return destination + path_separator + self.get_parent_folder(source, path_separator)
to
return os.path.join(destination, self.get_parent_folder(source, path_separator))

===============================================================================
Running with Python 2.7.13 (64-bit).
Pip list:
Package Version

---

-ryptography 3.3.2
bcrypt 3.1.7
certifi 2020.12.5
cffi 1.14.4
chardet 4.0.0
cryptography 3.3.2
enum34 1.1.10
idna 2.10
ipaddress 1.0.23
numpy 1.16.6
paramiko 2.2.1
pip 20.3.4
prompt-toolkit 2.0.10
pyasn1 0.4.8
pyasn1-modules 0.2.8
pycparser 2.20
pycrypto 2.6.1
Pygments 2.5.2
PyNaCl 1.4.0
python-ldap 3.2.0
requests 2.25.1
robotframework 3.1.2
robotframework-debuglibrary 2.2.1
robotframework-pythonlibcore 2.2.1
robotframework-requests 0.8.0
robotframework-ride 1.5.2.1
robotframework-selenium2library 3.0.0
robotframework-seleniumlibrary 4.5.0
robotframework-sshlibrary 3.6.0
robotremoteserver 1.1
scp 0.13.3
selenium 3.141.0
setuptools 28.8.0
six 1.15.0
UNKNOWN 0.0.0
urllib3 1.26.3
wcwidth 0.1.9
win-inet-pton 1.1.0

[robot-user-rudi]

Sorry, forgot to mention, that we are using long pathnames on local windows and therefor using UNC notation.
E.g.: \\?\C:\longlocalpath