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Why am I being charged by Cloud Storage on the free tier?

I'm using the App Engine to develop an app, no deployment to production yet only a few build of a very basic python backend and light frontend. I deploy the app in us-east-01 region, one of the three region availables for Cloud Storage for its free tier use. But for some reason I get billed for the use of Cloud Storage in this project for $0.01. The SKU description is "Networking Traffic Egress GCP Replication within Northern America" and the cost of use $0.01.

Accordingly to the docs Cloud Storage I shouldnt be charged, so What I'm missing here? Will I be charged for a cloud storage use for the deployed app? If I don't use Cloud Storage for anything else, Should expect any other charge?  

I expect to maintain the app only in a free tier, once deploy to production the use will be minimun. I really don't want to encounter another unexpected charge.

I verified the billing dashboard, I'm only getting billed by Cloud Storage in the same project of App Engine. I verified the region I chose to deploy the app in app engine, is us-east-01.

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