Opening checklist items on Calendar View are showing the incorrect cards and checklist items

Issue Summary

Users need to access the Calendar View of their boards to view checklist items with Due Dates. However, for some customers, upon opening the Calendar View of their boards, some Cards and Checklist items with Due Dates aren’t showing up, and sometimes, they do show up when opening them.

Steps to Reproduce

1. Create a card on your board
2. Add a checklist to the card, and add multiple checklist items with the same name, due date, and assignee (or different assignee)
3. Create a new card on your board, and copy the original checklist to the new card
4. Open the Calendar View
5. You'll notice that checking checklist items will end up checking multiple checklist items at the same time. Also, if there are different members assigned to these items, opening the card will start shuffling them in the background

Expected Results

All checklist items and cards with due dates should show up on the Calendar View.

Actual Results

Some checklist items and cards with due dates don’t show up on the Calendar View, or some of them get shuffled around.

Workaround

Customers affected by this problem can add the Calendar Power-Up to their boards, and they should be able to view all checklist items and cards with Due Dates as expected.