Unable to create branch from JIRA issue in case that some special characters are immediately after "." in the summary

Summary

Unable to create a branch from JIRA issue in case that some special characters are immediately after "." in the summary.

Environment

• JIRA Software 7.2.6

Steps to Reproduce

1. Integrate Bitbucket Server with JIRA Software
2. Create a issue whose summary is "test.<special character>" (e.g. "test./", "test.[")
   Please replace <special character> with a special character
3. Create a branch from the issue (You can select any Repository, Branch type, Branch from)

Expected Results

The special character and the dot "." should be trimmed appropriately and <issue key>-test should be created.

Actual Results

Only the special character was trimmed and "." wasn't.
That's why, the branch name was set to <issue key>-test. and it was unable to create the branch with the following error.

Notes

This problem seems to be an edge case of BSERV-4961.

Workaround

Rename the branch manually.