Got "permission denied for public schema" error in PostgreSQL DB using App Platform

Greetings,

I’m learning how to use the DO App Platform. I saw some guides on how to deploy to the App Platform using the app.yaml file. I can attach it here without the sensitive info:

name: *************
services:
  _#_ _Backend API Service_
  - name: api
    source_dir: /
    github:
      repo: *************
      branch: main
    run_command: npm run start:prod
    build_command: npm ci && npx prisma generate && npx @nestjs/cli build
    environment_slug: node-js
    instance_count: 1
    instance_size_slug: apps-s-1vcpu-1gb
    envs:
      - key: NODE_ENV
        value: production
      - key: PORT
        value: "8080"
      - key: DATABASE_URL
        value: ${db.DATABASE_URL}
      - key: JWT_SECRET
        value: *************
    health_check:
      http_path: /health
    http_port: 8080
    routes:
      - path: /api

static_sites:
  _#_ _Frontend Angular Service_
  - name: web
    source_dir: /
    github:
      repo: *************
      branch: develop
    build_command: npm ci && npm run build
    environment_slug: node-js
    output_dir: *************
    envs:
      - key: NODE_ENV
        value: production
    index_document: index.html
    catchall_document: index.html

_#_ _Managed PostgreSQL Database_
databases:
  - name: db
    engine: PG
    version: "17"
    production: false

As I understand, setting ‘databases.production’ to ‘false’ will create a dev database which has restricted permissions. I know that the user ‘db’ which is the same username as the instance will not have permissions to create other databases or other schemas. It will only have permissions on my own dev database created here in the public schema. The thing is: The ‘db’ user doesn’t have permissions to create tables on its own ‘db’ database. I’m not sure if I’m doing something wrong but I tested login to the database using the psql and the connection string but I cannot create tables:

Thank you in advance for your help!