Yes, the file does exists there, and downloading the output, xxx.snappy.parquet and reading using a parquet viewer, the data after loading with the viewer is also null. So the value is lost during the saving.

I also dont think the issue is the bucket itself or the path as using tempfile yields the same, changing the type of geo from double to string solves, but we couldnt understand why geo.longitude and geo.latitude types corrupts user_id field 😞
We're facing this same issue with more complex data structures, but this one should be "simpler" to use as example