Stacked charts not visible on tempo reports

We are facing an issue where we have the data displayed as stacked charts, we are able to see this stacked chart on the interface designer and the drill down works smooth. But when the same is configured on tempo reports we are not able to see the charts on the same.

while de-bugging this issue we were able to display the graph on temp reports by providing a read only text field in second column contents, so that the stacked chart is spanned only in first column content. But now we are not able to even see the chart in the first column content as well.

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