Issue Summary

When we have lists with a large number of mirrored cards, the board does not load all mirrored cards correctly, and has varying results.
This affects:

• Board filtering
• Viewing cards in the calendar view

Steps to Reproduce

1. Have multiple lists with a large number of mirror cards
2. Try filtering them using the filter button on the board.
3. Or load the calendar view.

Expected Results

Board views should return the expected data.

Actual Results

Filtered cards or other board views (e.g. calendar view) are different based on whether the board is properly rendered or not.

Workaround

Zoom out the lists and ensure all cards are properly loaded before applying the filters or switching to the board calendar view.