Pull request merged triggers wrong Jira issue

It seems to me that all Jira issues are linked to Bitbucket pull requests that are somehow referenced in messages of commits that are part of the pull request's associated source branch.

This leads to the bad case that the 'pull request merged' trigger is fired on multiple Jira issues, some of which might only be loosely related the the respective pull request, some might even be erroneously linked. This even happens with Smart Commits deactivated.

It should be possible to deactivate the linking between Jira issues and Bitbucket pull requests based on commit messages (the linkage based on branch names should remain in this case).