Can't import local Python modules in multi-node GPU cluster on Azure Databricks

Hello,

I have the following cluster: Multi-node GPU (NC4as_T4_v3) with runtime 16.1 ML + Unity Catalog enabled.

I cloned my repo in Repos:

my-repo/
├── notebook.ipynb
└── utils/
    ├── __init__.py
    └── my_module.py

In notebook.ipynb, I run:

from utils.my_module import some_function

• which works fine on CPU and serverless clusters. But on the GPU cluster, I get ModuleNotFoundError. sys.path looks fine (repo root is there)s
• os.listdir('.') and dbutils.fs.ls('.') return empty

Same exact code works on CPU. Is this a GPU-specific limitation(& if so, why) or security feature? Or a bug? Can’t find anything about this in the Databricks docs.

Thanks,