Traefik 2.4 - http not found, but https works

I'm using Traefik 2.4 via docker-compose for development server. Here's config

version: "3.8"

services:
  traefik:
    image: traefik:v2.4
    container_name: traefik
    command:
      - --api=true
      - --api.dashboard=true

      - --entrypoints.web.address=:80
      - --entrypoints.websecure.address=:443
      
      - --providers.docker=true
      - --providers.docker.exposedbydefault=false
      
      - "--certificatesresolvers.letsEncrypt.acme.httpchallenge=true"
      - "--certificatesresolvers.letsEncrypt.acme.httpchallenge.entrypoint=web"
      # - "--certificatesresolvers.letsEncrypt.acme.caserver=https://acme-staging-v02.api.letsencrypt.org/directory"
      - "--certificatesresolvers.letsEncrypt.acme.email=$ACME_EMAIL"
      - "--certificatesresolvers.letsEncrypt.acme.storage=/certs/acme.json"
    restart: always
    security_opt:
      - no-new-privileges:true
    env_file:
      - .env
    labels:
      traefik.enable: true
      traefik.http.routers.traefik.entrypoints: web,websecure
      traefik.http.routers.traefik.rule: Host(`monitor.$DEFAULT_HOST`)
      traefik.http.routers.traefik.tls.certresolver: letsEncrypt
      traefik.http.routers.traefik.service: api@internal

      traefik.http.middlewares.redirect-to-https.redirectscheme.scheme: https
      traefik.http.routers.traefik.middlewares: redirect-to-https
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./custom/:/custom/:ro
      - ./certs/:/certs/
    ports:
      - 80:80
      - 443:443

  whoami:
    image: "traefik/whoami"
    container_name: "traefik-whoami"
    restart: always
    labels:
      traefik.enable: true
      traefik.http.routers.whoami.entrypoints: web,websecure
      traefik.http.routers.whoami.rule: Host(`whoami.$DEFAULT_HOST`)
      traefik.http.routers.whoami.tls.certresolver: letsEncrypt

      traefik.http.middlewares.redirect-to-https.redirectscheme.scheme: https
      traefik.http.routers.traefik.middlewares: redirect-to-https

networks:
  default:
    external:
      name: $DEFAULT_NETWORK

I'm using flags configuration on purpose, because it's easier to configure using ENV variables.

As you can see, I have 2 entrypoints: web and websecure. And on my target service (whoami) I've configured both those entrypoints: traefik.http.routers.whoami.entrypoints: web,websecure. I've seen here, that somebody uses different routers for http and https, but this way of configuring seems weird: Traefik supports configuring multiple comma-separated entrypoints for same router, and it even shows them in UI:

It works almost fine, especially for HTTPS, BUT if I'll try to open it the same resource via HTTP, it results in 404 page not found

Example:

1. Try to open https://monitor.MYDOMAIN, and it successfully proxying traffic
2. Try to open http://monitor.MYDOMAIN, and it will show 404 page not found

This problem is not only appears for Traefik Dashboard, but for any type of router, whoami and any other mine projects

If Traefik supports configuring multiple entrypoints for same router, I expect it to work from both those entrypoints