Workflow pull request triggers always record anonymous users when performing a transition

Issue Summary

When using GitHub app or Bitbucket integration along with workflow triggers, the workflow transitions are shown as performed by Anonymous users

Steps to Reproduce

1. Connect your project with the GitHub for Jira app. 
2. Configure your workflow triggers so that PullRequestCreated or PullRequestMerged transition your issue accordingly.
3. Create or merge a pull request.

Expected Results

The user account who has performed the changes in GitHub is mapped correctly to a user on the issue history.

Actual Results

The issue history for the transition states that it was performed by an anonymous user.

This is despite confirming that with a smart commit using:

[Issue-Key]#comment TestComment 

the comments are created with the correct user name, so it is able to identify the user from the commit operations but not for the workflow triggers.

Workaround

Currently there is no known workaround for this behavior.