Progress in a milestone seems to count merge requests too

Don't know if it is deliberate or just a bug but it was a gotcha for me. The progress summary and progress bar in a milestone seems to also count in merge requests, which is unexpected. If I create 10 issues and close 5 of them, I expect the progress to be 50%, but instead it's 66% (10/15) because of 5 closed merge requests too.

This is expected behavior. MRs are realated to milestones either. If all issues are closed there is an additional information now:

Status changed to closed

mentioned in commit e6871279

Mentioned in commit e6871279

mentioned in merge request !14785