We are using the TelerikMultiColumnComboBox in AdaptiveMode.Auto and with an OnRead filter.

On small viewports and entering something in the searchbox, the key is cleared after entering just one char. This is only happening in the mobile view, otherwise it works fine and one can enter more characters.

The issue is reproducible when the `AllowCustom` parameter is set to `true`.
Typing rapidly in the input field of the MultiColumnComboBox component causes the entered text to blink. Also, some of the inserted symbols are cleared.

Reproduction (if bug)

Open this demo: https://demos.telerik.com/blazor-ui/multicolumncombobox/custom-values

Try to input text rapidly into the input field.

I was wondering if the component can filter rows by searching in more than one column.

When the MultiColumnComboBox columns are rendered with a foreach loop, the component doesn't remove columns that are no longer defined.

The workaround is to recreate the MultiColumnComboBox: https://blazorrepl.telerik.com/wSOIvzvR46lEZrwy43