pyspark dataframe in glue notebook mode=overwrite creates empty files at each path level

I'm writing partitioned parquet data using a Spark data frame and mode=overwrite to update stale partitions. I have this set: spark.conf.set('spark.sql.sources.partitionOverwriteMode','dynamic') The data is being written correctly with all the partitioning being set correctly, but I am also getting empty files created at each level of the path named <path_level>_$folder$. Removing mode=overwrite eliminates this strange behavior. Is there any way to prevent these zero size files from being created? Have I misconfigured something?