Create sub-task from Issues in Epics quick access menu assigns epic as parent instead of the intended story

Steps to Reproduce

1. Navigate to the View Issue screen of an Epic that has children Stories
2. Move mouse to the right of one of the children (Stories), found within the "Issues in Epic" web panel, notice that a quick access gear (dropdown) will appear
3. Click the pull-down of the access gear image and select "Create sub-task" (see screenshot below)

(screenshot notes: Epic is TST-24, child Story is TST-4)

Expected Results

Sub-task is created as the child of the Story (TST-4, the grandchild of the parent Epic), much like if Edit was selected from the quick access menu

Actual Results

Sub-task is created as the child of the Epic (TST-24)

Notes

Relates to current feature request:
JSWSERVER-15705 - Improper Message: A subtask cannot be assigned to an epic

Workaround

Do not use the quick access dropdown for sub-task creation.
Either:

1. Navigate to the Story which is intended to be the parent and create the sub-task from there, or:
2. Use a third-party add-on to automatically add sub-task children using post functions