Commit messages where a plus sign directly precedes a Jira issue key are missing from the development panel

Issue Summary

Commit messages where the Jira issue key is preceded with a plus sign are not linked in Jira - ie. missing from the commit section of the development panel. For example a commit message like 'commit to +BLA-13' will not create a commit link in Jira. It will 'link' correctly in Bitbucket.

Environment

Tested with Jira 7.6.9 and Bitbucket 5.7.1

Steps to Reproduce

1. Link a Jira 7.6.9 and Bitbucket 5.7.1 instance
2. Create a Repo
3. Create a commit and mention '+<Jiraissuekey>'. For example, use the commit message: git commit -m 'Initial commit of all files to the repository +BLA-11'

Expected Results

The commit message shows in the Commit area of the Jira issue. The commit message shows in Bitbucket with a link to the Jira issue.

Actual Results

The commit message shows and is linked in Bitbucket. The commit is missing from the Development panel in Jira.

See the below screenshots for examples:

Commit in Bitbucket

Development Panel in Jira

Workaround

Do not use a + sign immediately before the Jira issue key. Leave a space between the + and issue key.