docker-compose - NestJS container cannot access RethinkDB container - postgresql

Question

Problem
I am trying to containerize a full stack app. For now, I am putting the front-end aside, so I am trying to set up only three containers :
PostgreSQL
RethinkDB
NestJS
But when I try to run my containers with
docker-compose up
the NestJS container can't access the RethinkDB container.
Code
docker-compose.yaml
version: "3.9"
services:
opm_postgres:
container_name: opm_postgres_1
image: postgres
restart: always
environment:
POSTGRES_PASSWORD: *******
POSTGRES_USER: postgres
volumes:
- 'opm_postgres:/var/lib/postgresql/data'
opm_adminer:
container_name: opm_adminer_1
image: adminer
restart: always
ports:
- 8085:8080
opm_rethink:
container_name: opm_rethink_1
image: rethinkdb
restart: always
ports:
- 28016:28015
- 8084:8080
volumes:
- 'opm_rethink:/data'
opm_back:
container_name: opm_back_1
build: ../OPM-back
restart: always
ports:
- "3000:3000"
volumes:
opm_postgres:
opm_rethink:
NestJS Dockerfile (coming from : Ultimate Guide: NestJS Dockerfile For Production [2022])
# Base image
FROM node:14
# Create app directory
WORKDIR /usr/src/app
# A wildcard is used to ensure both package.json AND package-lock.json are copied
COPY package*.json ./
# Install app dependencies
RUN npm install
# Bundle app source
COPY . .
# Creates a "dist" folder with the production build
RUN npm run build
# Start the server using the production build
CMD [ "node", "dist/main.js" ]
Logs
docker-compose up
docker ps
Additional info
I used the containers names as DB hosts, both for RethinkDB and PostgreSQL.
Also, when I comment the rethink part in my docker-compose.yaml, everything works fine, I can call a route on my NestJS API and it queries correctly in my PostgreSQL db. The problem seems to be specific to RethinkDB.