Channels doesn't serve static files

I just configured channels on my project but when I enter the admin page or other pages, I see this error:

Refused to apply style from 'http://127.0.0.1:8000/static/admin/css/base.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
GET http://127.0.0.1:8000/static/admin/js/theme.js net::ERR_ABORTED 404 (Not Found)

Before configuring channels everything was loading correctly.

docker-compose:

services:
  backend:
    build: .
    container_name: backend
    command: daphne -b 0.0.0.0 -p 8000 core.asgi:application
    restart: always
    volumes:
      - ./core:/app
    ports:
      - "8000:8000"
    env_file:
      - ./.env.dev
    depends_on:
      - db

asgi.py:

import os

from channels.routing import ProtocolTypeRouter
from django.core.asgi import get_asgi_application

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "core.settings")
django_asgi_app = get_asgi_application()

application = ProtocolTypeRouter({
    "http": django_asgi_app,
})

settings.py:

DEBUG = True

ASGI_APPLICATION = "core.asgi.application"

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "channels.layers.InMemoryChannelLayer",
    }
}