The report items within the rectangle are not exported in CSV export. The tablix and text box both are inside the rectangle report item, but when we export to CSV the tablix data is not exporting, only the textbox data is exporting in CSV export.
Also, when we place that tablix outside the rectangle report item, it is exporting with tablix data too.
In MS report builder, both the textbox and tablix data inside the rectangle report item is exporting in CSV export. Need to fix this issue.