Issue Summary

In a team-managed project, when using a post function to update the field "Label" for transitioning between statuses, it overwrites the existing value of the label field, and the previously added labels on that issue are removed.

Steps to Reproduce

1. Create an issue and add a label.
2. Now create a post function rule to update the "label" field for a particular transition.
3. Include the desired label in this rule.
4. Transition the newly created issue to execute the post function rule.

Expected Results

The new label should get added in the label field along with the previously added label.

Actual Results

The newly added label overwrites the previously added label.

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available