Gitlab can't find pipeline built after merge request

[bryanyang0528]

#1934 changed the fetch branch from refs/heads/%s to refs/merge-requests/%d/head. But when I add a new commit in a merge request, the pipeline won't include in the MR because of the name of branch of commit didn't match the name of original branch.

This is a normal pipeline when I pushed a new branch to Gitlab.

This is the pipeline when I added commit in a MR.

And this pipeline won't show in the MR.

I'm not sure if anyone have the same issue, or there are something wrong of my configuration.
Thank you for your time.

[bradrydzewski]

I am closing this because a) it looks like a GitLab Pipeline issue and does not include any reference to drone and b) because our issue template asks you to open a discourse thread before creating a github issue