Running the following work without issue
docker run --rm --entrypoint python -p 127.0.0.1:8000:8000 python:3.8-slim -m http.server

But with the following it's not possible to reach the instance running in the container
docker run --rm --entrypoint python -p 127.0.0.5:8000:8000 python:3.8-slim -m http.server