The issue is reproducible when the grid consists only from Multi-header columns, the setDataSource() method has been used and one of the columns is initially hidden.
After setting the new data source, the last header gets hidden. The "display: none;" style has been applied to the "th" HTML element.
Steps to reproduce:
1. Create a grid with multi-header columns only.
2. Hide one column initially.
3. Set a new data source via the setDataSource() method.
4. The last column gets hidden.
Kendo UI version: 2019.1.220