docker-compose first-time up and Build, MySql server start slower than .net5 API

I am using MySQL with .net5 web API in docker. My docker configuration is Window10 Home with WSL2.

My Docker-compose and compose.override file like below

docker-compose.yml

version: '3.4'

services:
  userdb:
    image: mysql

  portainer:
    image: portainer/portainer-ce

  usermanagement.api:
    image: ${DOCKER_REGISTRY-}usermanagementapi
    build:
      context: .
      dockerfile: Services/User/User.API/Dockerfile

volumes:
  mysql_data:
  portainer_data:

docker-compose.override.yml

version: '3.4'

services:
  userdb:
    container_name: userdb
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=user
    ports:
      - "3306:3306"
    volumes:
      - mysql_data:/var/lib/mysql

  portainer:
    container_name: portainer
    restart: always
    ports:
      - "9000:9000"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - portainer_data:/data

  usermanagement.api:
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
      - "ConnectionStrings:DefaultConnection=server=userdb;port=3306;database=user;userid=root;pwd=root;"
    depends_on:
      - userdb
    ports:
      - "8001:80"

Whenever I build or up my docker-compose file the first time (fresh start or cleaning old volume then D-C up). Then it throws error MySql connection error MySqlConnector.MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts.

Then I have to manually stop and then start my API container. then the connection workss fine.

Am I doing something wrong or any solution for this issue Please share?