Gitlab merged a WIP branch

Summary

The same issue that appeared on https://gitlab.com/gitlab-org/gitlab-ce/issues/29210 is still happening, replicated on gitlab.com

Steps to reproduce

Reproduced on https://gitlab.com/ppanero/wip-merge-test please see the tree.

Example Project

https://gitlab.com/ppanero/wip-merge-test

What is the current bug behavior?

The WIP MR gets merged even if it shouldn't.

What is the expected correct behavior?

Keep the MR open, as nobody had it merged.