resolve conflict button don't shows in manual merge request

Summary

I can't merge interactive or inline because there is no button to do so.

Steps to reproduce

1)Create project in one account 2)Fork the project from other account 3)Modify projects in both account 4)create a pull request in the second account 5)try to resolve the merge request. Eror because it lacks the button

Example Project

bojorquez.ja/cicdspring!2

What is the current bug behavior?

I cant see any button to resolve conflicts

What is the expected correct behavior?

To appear an execute.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

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(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:env:info)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)