Some cells/rows don't load properly in large spreadsheets

[okennedy]

Describe the bug Certain rows and/or cells don't load properly in a spreadsheet (instead of cell contents, you get a spinner).

To Reproduce The bug is transient. On a sufficiently large dataset, it seems to happen to a random set of cells each time.

1. Open a spreadsheet
2. Click inside the spreadsheet to activate editing mode.
3. Scroll through the spreadsheet
4. Sometimes, certain cells will continue to have spinners

Expected behavior All cells load properly