The ComboBox and MultiComboBox replace the current filter value with the component value during virtual scrolling.

The issue is similar to MultiColumnComboBox and ComboBox remove filtering value after virtual scrolling , but the other issue occurred when there was no current value.

To reproduce:

1. Go to https://demos.telerik.com/blazor-ui/combobox/virtualization
2. Select item Changde
3. Filter by "Ch"
4. Scroll down

Ch will be replaced by Changde.

If custom values are not required, a possible workaround is to use a filterable DropDownList with virtualization.

For the MultiColumnComboBox, the component can use a RowTemplate to simulate multiple columns in the dropdown. You can see a REPL example here.