@BarryC this has worked. 

%pip install importlib-metadata==4.11.3
%pip instal zipp=3.8.0

Adding this at the start of your DLT UDF register notebook will solve the issue.

Databricks is advocating in all docs and tutorials to use DLT for ML inference, but this is a standard incompatibility inherent to the setup. I hope Databricks will take action and resolve this asap. 


Kind regards,

Data Interlaced ltd