Dates changing on Epics with a Fixed Start Date and Finish date

Summary

Dates changing on Epics with a Fixed Start Date and Finish date

Steps to reproduce

1. Create an epic with fixed start and finish dates (3 week long)
2. Edit the epic, add some issues (don't put any dates or milestones on the issues), save the epic
3. Go to the epic board
4. Click the title of the new epic to visit it.
5. Hit back on the browser to go back to the epic board.
6. Mouse over the epic and select it with the hand icon so the right sidebar becomes visible
7. Observe a GraphQL request sent with multiple updateEpic[Start|Due]Date operations.
8. Perhaps also see dates change right there.
9. Open the epic and you'll see in the history log that the dates moved up 1 day each (if change took place).

Example Project

I can't create an example project with the free version of gitlab.com since I need to be able to create epics to show the problem.

What is the current bug behavior?

Daily just by opening an existing Epic with fixed Start and Finish dates, those dates are decrementing by 1 with no other changes occurring. These epics don't have any issues with milestones attached to them.

What is the expected correct behavior?

Fixed dates should stay at the exact dates they are set to and should only change if they are edited. This should work even if you have issues with milestones or other dates. The fixed dates on the epic should override everything.

Relevant logs and/or screenshots

None of the changes in this log were intentional changes to the date. You can see where it subtracts 1 day off of both of the dates