[Python] Modin: switch to Pandas because of "Mixed Partitioning columns in Parquet"

I would like to use Modin to read a partitioned parquet. The parquet has a single partition key of type int. When I run it automatically switches to the default pandas implementation with the following message:

UserWarning: Defaulting to pandas implementation. Please refer to https://modin.readthedocs.io/en/stable/supported_apis/defaulting_to_pandas.html for explanation. Reason: Mixed partitioning columns in Parquet
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What am I missing?

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