cellClass function not called when cell data changes

If the data in a cell changes, the cellClass function is not called to update the class of the cell. The cell styling doesn't change until something forces the call such as sorting the table.

I am attempting to update cell data as it is updated from a message coming in over a websocket. The data in the table is updated and displayed. However, the cellClass function isn't called for the updated cell so the styling doesn't change.

I have recreated an example in the below plunker. If you click on the Change Velity button, the company text for the 3rd entry is changed to Aaaaaa but the text remains blue. Clicking on the column heading to sort the collumn displays the text as normal. Clicking the button again returns the company name to Velity. The text doesn't change back to blue. You have to sort the table to get the text to change back to blue. Plunker demonstrating problem