Found the related bug. What version of the UNtools are you using, this should have been resolved.
https://support.esri.com/en/bugs/nimbus/QlVHLTAwMDE0Mzk5MA==
type
import untools
untools.__version__
You should be on 2.6.3
if not, you can install the update through the python package manager or using the conda command line
Open Python Command Prompt
conda install untools=2.6.3