Merge Request deployment link showing the wrong link

Summary

I use gitlab-ci with a custom system deployment with basic scheme like branch.env.domain.tld

Steps to reproduce

Open first MR feature A that'll create pipeline deployment to 1-feature-a.dev.domain.tld

Create second MR feature B that'll create pipeline deployment to 2-feature-b.dev.domain.tld

What is the current bug behavior?

When reopen first MR, i show the link to de second MR

What is the expected correct behavior?

I expect view the correct link in MR not the last run in the same environment

Results of GitLab environment info

Expand for output related to GitLab environment info

GitLab 10.2.0
GitLab Shell 5.9.4
GitLab Workhorse v3.3.1
GitLab API v4
Gitaly 0.52.0
Git 2.13.6
Ruby 2.3.5p376
Rails 4.2.8
postgresql 9.6.5

Possible fixes

Simple permalink system should work