One of the participants rightly pointed that it was possible to get the schema information of the private buildings by printing the data and causing an error in the submission to get the logs.
In light of this, we have disabled the logs for the private runs, you will still be able to see logs for the rendering run.
It is against the spirit of the competition to try and obtain private data. We hope that no one has used this exploit, and will closely monitor the logs.
If you face any issues due to the removal of the logs, please let us know.