Describe the bug
When you use the filterGroupByField method, if there are more than 2 filtered items, the method returns null. If the filtered items are one or two, the method works correctly.
- Open this StackBlitz example
- Open Browser's console(F12)
- Click on the "ProductName" column menu and select 3 or more checkboxes
- See the output in the console which is "null"
The result returned from the filterGroupByField method should be with a structure similar to the below one, no matter how many checkboxes have been selected in the column menu.