Grid's headers break upon ungrouping when the filterable mode is set to "row"

[alestoya]

Bug report

Grid's headers break upon ungrouping when the filterable mode is set to "row"

Reproduction of the problem

1. Run the following dojo.
2. Drag a column for grouping.
3. Ungroup the column.

Current behavior

Upon ungrouping the Grid's headers are disrupted.

Expected/desired behavior

The Grid's headers should not be disrupted upon ungrouping.

Environment

• Kendo UI version: 2022.3.913
• Browser: [all]