Why won't rancher-compose update external services?

Rancher 1.x
1

Changing a service defined as an external service does nothing when rancher-compose up or rancher-compose up -u is run. Even adding --force-recreate does nothing.

What is the rationale for this behavior?

Example:

docker-compose.yml:

version: '2'
  dbserver:
    image: rancher/external-service

rancher-compose.yml:

version: '2'
  dbserver:
    hostname: example.com
2

Anyone? Should I open a ticket?

NM, I opened an issue.