Sub-tasks are not visible when filtering by team

Summary

When viewing a board in portfolio, the default view will allow you to see Stories, and expand on them to also see their subtasks. However when filtering by Team, the parent stories are still displayed, but trying to expand this does not display the subtasks of those stories as expected.

Steps to Reproduce

1. creating a plan and using a board(s) that has stories w/ sub-tasks.
2. Assign those stories to the automatic team created or import a shared team and assign.
3. Identify the stories with sub-tasks without any filters set.
4. Filter by the Team assigned to those issues.

Expected Results

All issues display down to the sub-task level.

Actual Results

Epics and stories display, but sub-tasks are not visible.

Notes

It does not seem to matter who those subtasks are assigned to, they never display when any team filter is selected.

Workaround

none

Screenshots of issue:
First screenshot shows those subtasks are viewable when no team filter is selected:

Second screenshot shows parent issue, but none of it's subtasks. This happens when any value exists in the Team Filter.