Running on docker-compose: mysqli::real_connect(): (HY000/1045): Access denied for user 'root'@'172.26.0.12' (using password: YES)

The configuration below works just fine on my local machine:

My docker-compose.yml file:

networks:
    mynet:
        name: mynet
        driver: bridge
services:
    mydb:
        container_name: mydb
        image: mysql:8.4.2
        hostname: mydb
        restart: unless-stopped
        environment:
            MYSQL_ROOT_PASSWORD: ${ROOT_PASSWORD}
            MYSQL_DATABASE: default_db
        networks:
            - mynet
        volumes:
            - ${DATA_VOLUME}:/var/lib/mysql
        ports:
            - ${EXPOSE_PORT}:3306

    myadmin:
        container_name: myadmin
        image: phpmyadmin/phpmyadmin:5.2.1
        hostname: myadmin
        depends_on:
            - mydb
        restart: unless-stopped
        environment:
            PMA_HOST: mydb
            # PMA_PORT: 3306 - I tried with this parameter too
            # PMA_ARBITRARY: 1 - I tried with this parameter too
            # MYSQL_USERNAME: "root" - I tried with this parameter too
            MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
        networks:
            - mynet
        ports:
            - ${PMA_EXPOSE_PORT}:80

And here is the .env file:

ROOT_PASSWORD=mystrongpwd
DATA_VOLUME=/path/to/my/colume
EXPOSE_PORT=3333
PMA_EXPOSE_PORT=4444

But when I'm trying to login to myadmin, I get this error:

mysqli::real_connect(): (HY000/1045): Access denied for user 'root'@'172.26.0.12' (using password: YES)

UPDATE: So, there is a question here:Enable remote MySQL connection: ERROR 1045 (28000): Access denied for user which causes this question to get closed by the users. but that is not the answer. I found the answer and I post it below.

I changed these to things and all works fine:

# in environment section:
environment:
    MYSQL_ROOT_HOST: '%'
    # the rest of envs

# also I had to add this command:
command: ["mysqld", "--mysql-native-password=ON"]

I'm using mysql:8.4.2 and it seems to enabling password login with root just needs the ["mysqld", "--mysql-native-password=ON"] command. Also, it's pretty new to me, but login from another container was not allowed unless I added the MYSQL_ROOT_HOST: '%' part.