System notes don't update when milestone is renamed

Summary

After renaming a milestone, the system notes referencing it still show the old name.

Steps to reproduce

  • create issue
  • create milestone
  • assign milestone to issue
  • rename milestone
  • open issue again

What is the current bug behavior?

system note still shows old milestone

What is the expected correct behavior?

system note updates

Screenshot

Screen_Shot_2017-08-04_at_11.27.53

(https://gitlab.com/reproduction-group/foo/issues/2#note_36752547)