Vaadin Grid Cell Renderer issue when reloading data

We are having a really weird issue with our grid, we load the grid with data and have some custom cell renderers everthing works fine.....we get a update and load new data, the cell renderer never gets called for the first row index and keeps the previous state of the data for the first row only.

we have debugged and looked at the grid.items array and it has all the correct data for the update, we have a break point in the grid.item observer that calls the refreshItems when changed, and that gets executed.  Our cell render function never gets called for data with index of 0;

It seems an issue in the code.
I will try to take a while to reproduce and figure out what is happening.

Hi, I have tried to reproduce the problem and I'm unable to see.

Here you have the code I'm working with
https://jsfiddle.net/sx1uwd01/3/

As you can see, by clicking on the button the counter increases, and all the rows are updated.
The renderer is called for all rows, included the first one.

I might be doing something wrong, could you modify this fiddle or provide another one to see the issue ?