This is in our Prod Cluster with DC/OS EE 1.9 and Marathon 1.4.2.
When changing a Service ID of a running service I would expect it to run a new service with the new name.
No changes made. Also no error messages or anything that would lead to the conclusion that a change of the Service ID won't turn into effect.
Video of the bug: https://cl.ly/1z362s0S3p0A
Manually destroying the app and re-adding it under new Service ID.