Connection lost when Tool get to column64 function

The tool runs the first few functions during assesment without issue creating the utility-checker output file and populating but whe it gets to the column64 function there is a problem connecting.

Here is the app.log log and the proxy log



it is running in a GCP recently created Debian 12 VM within the same project of the cloudSQL instance

All rights and grants have been checked and the service account that connects to gcloud has CloudSQL Admin in IAM
Database user used is root so there should be no grants issue

The app.log states a root user access denied but it connected correctly in previous funcions

The proxy connection port is 3306 as so the 5.7 uses por 3306, the proxy reflects a connection to the instance public IP but using 3307, is there a problem or hard coded port that should be 3306 ?