<!--- Please read this! Before opening a new issue, make sure to search for keywords in the issues filtered by the "regression" or "bug" label. For the Community Edition issue tracker: - https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=regression - https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=bug For the Enterprise Edition issue tracker: - https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=regression - https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name%5B%5D=bug and verify the issue you're about to submit isn't a duplicate. ---> ### Summary I find this problem has been going on for a long time, and it seems that version updates have not been solved. This problem only occurs in some projects. all projects I am owner and I logged in. ### Steps to reproduce - go to an project and go to issues - enter one issue - you will see follow the “show all activity” button ---"checking branch availability....."  - The right situation:then the button "create merge request" will shown  - but in some projects after a moment the "checking branch availability....." will hide and no button show(I don't know why)  I use Gitlab 12.2.3 ce and I do not know this issue maybe Is it related to permissions or/and project repository settings? ### What is the current *bug* behavior? some projects do not show “create merge request” button in issue details page ### What is the expected *correct* behavior? should show “create merge request” button in issue details page