Datatable cell addCellCss not working

I am trying to update a cell’s CSS using datatable.addCellCss(row,col,css). The cell does not visually update. I also have datatable.getCss(row,col) to verify that the CSS is there, which it is. But I don’t see any visual change.

I also have made sure that my CSS class is correct.

EDIT: In my code, I am syncing the data collection to the data table. This seems to be the reason why the CSS is not working. Why would a data collection sync affect the CSS?

Hello @billtricarico ,
Please, look at this sample https://snippet.webix.com/81c0tyqi . It seems that everything works fine.
Maybe it will help you to solve it. If it doesn’t, please, show your implementation with the problem.